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[5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} #618

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[5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug}#618
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bug

Description

@duxabilii
duxabilii
opened on Aug 19, 2026

Description

Opening an entry that has a CKEditor field crashes the Control Panel if the field’s Default Upload Location subpath uses an object template such as {slug}.

craft\errors\InvalidSubpathException: Could not resolve the subpath “{slug}”.
in craft/helpers/Assets.php (resolveSubpath)
from craft\ckeditor\Field::_defaultUploadFolderId()

The subpath is evaluated as an object template (same as Assets fields), but _defaultUploadFolderId() never receives the current element:

// Field.php (_inputHtml)'defaultUploadFolderId' => $this->_defaultUploadFolderId(),
// Field.php (_defaultUploadFolderId)
[$subpath, $folder] = AssetsHelper::resolveSubpath($volume, trim($subpath ?? '', '/'));

Assets::resolveSubpath() is called with $element = null, so {slug} / {{ object.slug }} cannot resolve.

Assets fields handle this by:

  1. Passing the source element into subpath resolution
  2. Catching InvalidSubpathException and falling back to the user’s temp upload folder for new/draft entries

CKEditor does neither, so any dynamic subpath takes down the whole editor screen — even on already-saved entries that have a real slug.

_inputHtml() already has $element (it is passed to _linkOptions($element) on the next line).

Steps to reproduce

  1. Create a CKEditor field with Insert image in the toolbar.
  2. Under Assets, set Default Upload Location to a volume and subpath {slug}.
  3. Add the field to an entry type that has a slug (e.g. a channel section).
  4. Open an existing entry (or create a new one) that uses that field.

Expected: The editor loads. Drag-and-drop uploads go to a folder named after the entry slug (or the temp upload folder if the slug cannot be resolved yet).

Actual: The CP screen fails with InvalidSubpathException: Could not resolve the subpath “{slug}”.

A static subpath (e.g. posts) works. {slug} on a regular Assets field on the same entry also works.

Additional info

  • Craft version: 5.10.13.2
  • PHP version: 8.4.22
  • Database driver & version: PostgreSQL 18.6
  • Plugins & versions:
    • CKEditor 5.7.0
    • Bramble Search 1.5.0
    • Child Me! 2.2.3
    • Code Field 5.0.2
    • Control Panel Nav 5.0.7
    • Craft MCP v1.2.2
    • Freeform 5.15.26
    • Google Cloud Storage 2.2.2
    • Metrix 2.0.5
    • Navigation 3.0.22
    • Neo 5.5.12
    • Sentry Logger 5.0.3
    • SEOmatic 5.1.22
    • Sprout Redirects 5.0.9
    • Workflow 3.0.16

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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function addCopyButtons() {
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observer.observe(document.body, { childList: true, subtree: true });
})();
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} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
[5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} · Issue #618 · craftcms/ckeditor · GitHub
      Skip to content
      [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} #618
      Open
      Open
      [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug}#618
      Labels
      bug
      Description
      @duxabilii
      duxabilii
      opened on Aug 19, 2026
      Description
      Opening an entry that has a CKEditor field crashes the Control Panel if the field’s Default Upload Location subpath uses an object template such as {slug}.
      craft\errors\InvalidSubpathException: Could not resolve the subpath “{slug}”.
in craft/helpers/Assets.php (resolveSubpath)
from craft\ckeditor\Field::_defaultUploadFolderId()

      The subpath is evaluated as an object template (same as Assets fields), but _defaultUploadFolderId() never receives the current element:
      // Field.php (_inputHtml)'defaultUploadFolderId' => $this->_defaultUploadFolderId(),
      // Field.php (_defaultUploadFolderId)
[$subpath, $folder] = AssetsHelper::resolveSubpath($volume, trim($subpath ?? '', '/'));
      Assets::resolveSubpath() is called with $element = null, so {slug} / {{ object.slug }} cannot resolve.
      Assets fields handle this by:
      1. Passing the source element into subpath resolution
      2. Catching InvalidSubpathException and falling back to the user’s temp upload folder for new/draft entries
      CKEditor does neither, so any dynamic subpath takes down the whole editor screen — even on already-saved entries that have a real slug.
      _inputHtml() already has $element (it is passed to _linkOptions($element) on the next line).
      Steps to reproduce
      1. Create a CKEditor field with Insert image in the toolbar.
      2. Under Assets, set Default Upload Location to a volume and subpath {slug}.
      3. Add the field to an entry type that has a slug (e.g. a channel section).
      4. Open an existing entry (or create a new one) that uses that field.
      Expected: The editor loads. Drag-and-drop uploads go to a folder named after the entry slug (or the temp upload folder if the slug cannot be resolved yet).
      Actual: The CP screen fails with InvalidSubpathException: Could not resolve the subpath “{slug}”.
      A static subpath (e.g. posts) works. {slug} on a regular Assets field on the same entry also works.
      Additional info
      • Craft version: 5.10.13.2
      • PHP version: 8.4.22
      • Database driver & version: PostgreSQL 18.6
      • Plugins & versions:

        • CKEditor 5.7.0
        • Bramble Search 1.5.0
        • Child Me! 2.2.3
        • Code Field 5.0.2
        • Control Panel Nav 5.0.7
        • Craft MCP v1.2.2
        • Freeform 5.15.26
        • Google Cloud Storage 2.2.2
        • Metrix 2.0.5
        • Navigation 3.0.22
        • Neo 5.5.12
        • Sentry Logger 5.0.3
        • SEOmatic 5.1.22
        • Sprout Redirects 5.0.9
        • Workflow 3.0.16
      Metadata
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      No one assigned
        Labels
        bug
        Type
        No type
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        No projects
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          No milestone
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          None yet
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          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
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document.head.appendChild(style);
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} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} · Issue #618 · craftcms/ckeditor · GitHub
          Skip to content
          [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} #618
          Open
          Open
          [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug}#618
          Labels
          bug
          Description
          @duxabilii
          duxabilii
          opened on Aug 19, 2026
          Description
          Opening an entry that has a CKEditor field crashes the Control Panel if the field’s Default Upload Location subpath uses an object template such as {slug}.
          craft\errors\InvalidSubpathException: Could not resolve the subpath “{slug}”.
in craft/helpers/Assets.php (resolveSubpath)
from craft\ckeditor\Field::_defaultUploadFolderId()

          The subpath is evaluated as an object template (same as Assets fields), but _defaultUploadFolderId() never receives the current element:
          // Field.php (_inputHtml)'defaultUploadFolderId' => $this->_defaultUploadFolderId(),
          // Field.php (_defaultUploadFolderId)
[$subpath, $folder] = AssetsHelper::resolveSubpath($volume, trim($subpath ?? '', '/'));
          Assets::resolveSubpath() is called with $element = null, so {slug} / {{ object.slug }} cannot resolve.
          Assets fields handle this by:
          1. Passing the source element into subpath resolution
          2. Catching InvalidSubpathException and falling back to the user’s temp upload folder for new/draft entries
          CKEditor does neither, so any dynamic subpath takes down the whole editor screen — even on already-saved entries that have a real slug.
          _inputHtml() already has $element (it is passed to _linkOptions($element) on the next line).
          Steps to reproduce
          1. Create a CKEditor field with Insert image in the toolbar.
          2. Under Assets, set Default Upload Location to a volume and subpath {slug}.
          3. Add the field to an entry type that has a slug (e.g. a channel section).
          4. Open an existing entry (or create a new one) that uses that field.
          Expected: The editor loads. Drag-and-drop uploads go to a folder named after the entry slug (or the temp upload folder if the slug cannot be resolved yet).
          Actual: The CP screen fails with InvalidSubpathException: Could not resolve the subpath “{slug}”.
          A static subpath (e.g. posts) works. {slug} on a regular Assets field on the same entry also works.
          Additional info
          • Craft version: 5.10.13.2
          • PHP version: 8.4.22
          • Database driver & version: PostgreSQL 18.6
          • Plugins & versions:

            • CKEditor 5.7.0
            • Bramble Search 1.5.0
            • Child Me! 2.2.3
            • Code Field 5.0.2
            • Control Panel Nav 5.0.7
            • Craft MCP v1.2.2
            • Freeform 5.15.26
            • Google Cloud Storage 2.2.2
            • Metrix 2.0.5
            • Navigation 3.0.22
            • Neo 5.5.12
            • Sentry Logger 5.0.3
            • SEOmatic 5.1.22
            • Sprout Redirects 5.0.9
            • Workflow 3.0.16
          Metadata
          Metadata
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          No one assigned
            Labels
            bug
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
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span.className = 'userscript-highlight';
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frag.appendChild(span);
}
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node.parentNode.replaceChild(frag, node);
}
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} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} · Issue #618 · craftcms/ckeditor · GitHub
              Skip to content
              [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} #618
              Open
              Open
              [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug}#618
              Labels
              bug
              Description
              @duxabilii
              duxabilii
              opened on Aug 19, 2026
              Description
              Opening an entry that has a CKEditor field crashes the Control Panel if the field’s Default Upload Location subpath uses an object template such as {slug}.
              craft\errors\InvalidSubpathException: Could not resolve the subpath “{slug}”.
in craft/helpers/Assets.php (resolveSubpath)
from craft\ckeditor\Field::_defaultUploadFolderId()

              The subpath is evaluated as an object template (same as Assets fields), but _defaultUploadFolderId() never receives the current element:
              // Field.php (_inputHtml)'defaultUploadFolderId' => $this->_defaultUploadFolderId(),
              // Field.php (_defaultUploadFolderId)
[$subpath, $folder] = AssetsHelper::resolveSubpath($volume, trim($subpath ?? '', '/'));
              Assets::resolveSubpath() is called with $element = null, so {slug} / {{ object.slug }} cannot resolve.
              Assets fields handle this by:
              1. Passing the source element into subpath resolution
              2. Catching InvalidSubpathException and falling back to the user’s temp upload folder for new/draft entries
              CKEditor does neither, so any dynamic subpath takes down the whole editor screen — even on already-saved entries that have a real slug.
              _inputHtml() already has $element (it is passed to _linkOptions($element) on the next line).
              Steps to reproduce
              1. Create a CKEditor field with Insert image in the toolbar.
              2. Under Assets, set Default Upload Location to a volume and subpath {slug}.
              3. Add the field to an entry type that has a slug (e.g. a channel section).
              4. Open an existing entry (or create a new one) that uses that field.
              Expected: The editor loads. Drag-and-drop uploads go to a folder named after the entry slug (or the temp upload folder if the slug cannot be resolved yet).
              Actual: The CP screen fails with InvalidSubpathException: Could not resolve the subpath “{slug}”.
              A static subpath (e.g. posts) works. {slug} on a regular Assets field on the same entry also works.
              Additional info
              • Craft version: 5.10.13.2
              • PHP version: 8.4.22
              • Database driver & version: PostgreSQL 18.6
              • Plugins & versions:

                • CKEditor 5.7.0
                • Bramble Search 1.5.0
                • Child Me! 2.2.3
                • Code Field 5.0.2
                • Control Panel Nav 5.0.7
                • Craft MCP v1.2.2
                • Freeform 5.15.26
                • Google Cloud Storage 2.2.2
                • Metrix 2.0.5
                • Navigation 3.0.22
                • Neo 5.5.12
                • Sentry Logger 5.0.3
                • SEOmatic 5.1.22
                • Sprout Redirects 5.0.9
                • Workflow 3.0.16
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                bug
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
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if (u.searchParams.has(p)) {
u.searchParams.delete(p);
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} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
[5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} · Issue #618 · craftcms/ckeditor · GitHub
                  Skip to content
                  [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} #618
                  Open
                  Open
                  [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug}#618
                  Labels
                  bug
                  Description
                  @duxabilii
                  duxabilii
                  opened on Aug 19, 2026
                  Description
                  Opening an entry that has a CKEditor field crashes the Control Panel if the field’s Default Upload Location subpath uses an object template such as {slug}.
                  craft\errors\InvalidSubpathException: Could not resolve the subpath “{slug}”.
in craft/helpers/Assets.php (resolveSubpath)
from craft\ckeditor\Field::_defaultUploadFolderId()

                  The subpath is evaluated as an object template (same as Assets fields), but _defaultUploadFolderId() never receives the current element:
                  // Field.php (_inputHtml)'defaultUploadFolderId' => $this->_defaultUploadFolderId(),
                  // Field.php (_defaultUploadFolderId)
[$subpath, $folder] = AssetsHelper::resolveSubpath($volume, trim($subpath ?? '', '/'));
                  Assets::resolveSubpath() is called with $element = null, so {slug} / {{ object.slug }} cannot resolve.
                  Assets fields handle this by:
                  1. Passing the source element into subpath resolution
                  2. Catching InvalidSubpathException and falling back to the user’s temp upload folder for new/draft entries
                  CKEditor does neither, so any dynamic subpath takes down the whole editor screen — even on already-saved entries that have a real slug.
                  _inputHtml() already has $element (it is passed to _linkOptions($element) on the next line).
                  Steps to reproduce
                  1. Create a CKEditor field with Insert image in the toolbar.
                  2. Under Assets, set Default Upload Location to a volume and subpath {slug}.
                  3. Add the field to an entry type that has a slug (e.g. a channel section).
                  4. Open an existing entry (or create a new one) that uses that field.
                  Expected: The editor loads. Drag-and-drop uploads go to a folder named after the entry slug (or the temp upload folder if the slug cannot be resolved yet).
                  Actual: The CP screen fails with InvalidSubpathException: Could not resolve the subpath “{slug}”.
                  A static subpath (e.g. posts) works. {slug} on a regular Assets field on the same entry also works.
                  Additional info
                  • Craft version: 5.10.13.2
                  • PHP version: 8.4.22
                  • Database driver & version: PostgreSQL 18.6
                  • Plugins & versions:

                    • CKEditor 5.7.0
                    • Bramble Search 1.5.0
                    • Child Me! 2.2.3
                    • Code Field 5.0.2
                    • Control Panel Nav 5.0.7
                    • Craft MCP v1.2.2
                    • Freeform 5.15.26
                    • Google Cloud Storage 2.2.2
                    • Metrix 2.0.5
                    • Navigation 3.0.22
                    • Neo 5.5.12
                    • Sentry Logger 5.0.3
                    • SEOmatic 5.1.22
                    • Sprout Redirects 5.0.9
                    • Workflow 3.0.16
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    bug
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
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// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
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if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
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var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} · Issue #618 · craftcms/ckeditor · GitHub
                      Skip to content
                      [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} #618
                      Open
                      Open
                      [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug}#618
                      Labels
                      bug
                      Description
                      @duxabilii
                      duxabilii
                      opened on Aug 19, 2026
                      Description
                      Opening an entry that has a CKEditor field crashes the Control Panel if the field’s Default Upload Location subpath uses an object template such as {slug}.
                      craft\errors\InvalidSubpathException: Could not resolve the subpath “{slug}”.
in craft/helpers/Assets.php (resolveSubpath)
from craft\ckeditor\Field::_defaultUploadFolderId()

                      The subpath is evaluated as an object template (same as Assets fields), but _defaultUploadFolderId() never receives the current element:
                      // Field.php (_inputHtml)'defaultUploadFolderId' => $this->_defaultUploadFolderId(),
                      // Field.php (_defaultUploadFolderId)
[$subpath, $folder] = AssetsHelper::resolveSubpath($volume, trim($subpath ?? '', '/'));
                      Assets::resolveSubpath() is called with $element = null, so {slug} / {{ object.slug }} cannot resolve.
                      Assets fields handle this by:
                      1. Passing the source element into subpath resolution
                      2. Catching InvalidSubpathException and falling back to the user’s temp upload folder for new/draft entries
                      CKEditor does neither, so any dynamic subpath takes down the whole editor screen — even on already-saved entries that have a real slug.
                      _inputHtml() already has $element (it is passed to _linkOptions($element) on the next line).
                      Steps to reproduce
                      1. Create a CKEditor field with Insert image in the toolbar.
                      2. Under Assets, set Default Upload Location to a volume and subpath {slug}.
                      3. Add the field to an entry type that has a slug (e.g. a channel section).
                      4. Open an existing entry (or create a new one) that uses that field.
                      Expected: The editor loads. Drag-and-drop uploads go to a folder named after the entry slug (or the temp upload folder if the slug cannot be resolved yet).
                      Actual: The CP screen fails with InvalidSubpathException: Could not resolve the subpath “{slug}”.
                      A static subpath (e.g. posts) works. {slug} on a regular Assets field on the same entry also works.
                      Additional info
                      • Craft version: 5.10.13.2
                      • PHP version: 8.4.22
                      • Database driver & version: PostgreSQL 18.6
                      • Plugins & versions:

                        • CKEditor 5.7.0
                        • Bramble Search 1.5.0
                        • Child Me! 2.2.3
                        • Code Field 5.0.2
                        • Control Panel Nav 5.0.7
                        • Craft MCP v1.2.2
                        • Freeform 5.15.26
                        • Google Cloud Storage 2.2.2
                        • Metrix 2.0.5
                        • Navigation 3.0.22
                        • Neo 5.5.12
                        • Sentry Logger 5.0.3
                        • SEOmatic 5.1.22
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                        • Workflow 3.0.16
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} · Issue #618 · craftcms/ckeditor · GitHub
                          Skip to content
                          [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} #618
                          Open
                          Open
                          [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug}#618
                          Labels
                          bug
                          Description
                          @duxabilii
                          duxabilii
                          opened on Aug 19, 2026
                          Description
                          Opening an entry that has a CKEditor field crashes the Control Panel if the field’s Default Upload Location subpath uses an object template such as {slug}.
                          craft\errors\InvalidSubpathException: Could not resolve the subpath “{slug}”.
in craft/helpers/Assets.php (resolveSubpath)
from craft\ckeditor\Field::_defaultUploadFolderId()

                          The subpath is evaluated as an object template (same as Assets fields), but _defaultUploadFolderId() never receives the current element:
                          // Field.php (_inputHtml)'defaultUploadFolderId' => $this->_defaultUploadFolderId(),
                          // Field.php (_defaultUploadFolderId)
[$subpath, $folder] = AssetsHelper::resolveSubpath($volume, trim($subpath ?? '', '/'));
                          Assets::resolveSubpath() is called with $element = null, so {slug} / {{ object.slug }} cannot resolve.
                          Assets fields handle this by:
                          1. Passing the source element into subpath resolution
                          2. Catching InvalidSubpathException and falling back to the user’s temp upload folder for new/draft entries
                          CKEditor does neither, so any dynamic subpath takes down the whole editor screen — even on already-saved entries that have a real slug.
                          _inputHtml() already has $element (it is passed to _linkOptions($element) on the next line).
                          Steps to reproduce
                          1. Create a CKEditor field with Insert image in the toolbar.
                          2. Under Assets, set Default Upload Location to a volume and subpath {slug}.
                          3. Add the field to an entry type that has a slug (e.g. a channel section).
                          4. Open an existing entry (or create a new one) that uses that field.
                          Expected: The editor loads. Drag-and-drop uploads go to a folder named after the entry slug (or the temp upload folder if the slug cannot be resolved yet).
                          Actual: The CP screen fails with InvalidSubpathException: Could not resolve the subpath “{slug}”.
                          A static subpath (e.g. posts) works. {slug} on a regular Assets field on the same entry also works.
                          Additional info
                          • Craft version: 5.10.13.2
                          • PHP version: 8.4.22
                          • Database driver & version: PostgreSQL 18.6
                          • Plugins & versions:

                            • CKEditor 5.7.0
                            • Bramble Search 1.5.0
                            • Child Me! 2.2.3
                            • Code Field 5.0.2
                            • Control Panel Nav 5.0.7
                            • Craft MCP v1.2.2
                            • Freeform 5.15.26
                            • Google Cloud Storage 2.2.2
                            • Metrix 2.0.5
                            • Navigation 3.0.22
                            • Neo 5.5.12
                            • Sentry Logger 5.0.3
                            • SEOmatic 5.1.22
                            • Sprout Redirects 5.0.9
                            • Workflow 3.0.16
                          Metadata
                          Metadata
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
[5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} · Issue #618 · craftcms/ckeditor · GitHub
                              Skip to content
                              [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug} #618
                              Open
                              Open
                              [5.x]: InvalidSubpathException when Default Upload Location uses an object template like {slug}#618
                              Labels
                              bug
                              Description
                              @duxabilii
                              duxabilii
                              opened on Aug 19, 2026
                              Description
                              Opening an entry that has a CKEditor field crashes the Control Panel if the field’s Default Upload Location subpath uses an object template such as {slug}.
                              craft\errors\InvalidSubpathException: Could not resolve the subpath “{slug}”.
in craft/helpers/Assets.php (resolveSubpath)
from craft\ckeditor\Field::_defaultUploadFolderId()

                              The subpath is evaluated as an object template (same as Assets fields), but _defaultUploadFolderId() never receives the current element:
                              // Field.php (_inputHtml)'defaultUploadFolderId' => $this->_defaultUploadFolderId(),
                              // Field.php (_defaultUploadFolderId)
[$subpath, $folder] = AssetsHelper::resolveSubpath($volume, trim($subpath ?? '', '/'));
                              Assets::resolveSubpath() is called with $element = null, so {slug} / {{ object.slug }} cannot resolve.
                              Assets fields handle this by:
                              1. Passing the source element into subpath resolution
                              2. Catching InvalidSubpathException and falling back to the user’s temp upload folder for new/draft entries
                              CKEditor does neither, so any dynamic subpath takes down the whole editor screen — even on already-saved entries that have a real slug.
                              _inputHtml() already has $element (it is passed to _linkOptions($element) on the next line).
                              Steps to reproduce
                              1. Create a CKEditor field with Insert image in the toolbar.
                              2. Under Assets, set Default Upload Location to a volume and subpath {slug}.
                              3. Add the field to an entry type that has a slug (e.g. a channel section).
                              4. Open an existing entry (or create a new one) that uses that field.
                              Expected: The editor loads. Drag-and-drop uploads go to a folder named after the entry slug (or the temp upload folder if the slug cannot be resolved yet).
                              Actual: The CP screen fails with InvalidSubpathException: Could not resolve the subpath “{slug}”.
                              A static subpath (e.g. posts) works. {slug} on a regular Assets field on the same entry also works.
                              Additional info
                              • Craft version: 5.10.13.2
                              • PHP version: 8.4.22
                              • Database driver & version: PostgreSQL 18.6
                              • Plugins & versions:

                                • CKEditor 5.7.0
                                • Bramble Search 1.5.0
                                • Child Me! 2.2.3
                                • Code Field 5.0.2
                                • Control Panel Nav 5.0.7
                                • Craft MCP v1.2.2
                                • Freeform 5.15.26
                                • Google Cloud Storage 2.2.2
                                • Metrix 2.0.5
                                • Navigation 3.0.22
                                • Neo 5.5.12
                                • Sentry Logger 5.0.3
                                • SEOmatic 5.1.22
                                • Sprout Redirects 5.0.9
                                • Workflow 3.0.16
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                bug
                                Type
                                No type
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions