EUVD-2026-332208

fkie_cve-2026-50279

Craft CMS is a content management system (CMS). IN versions 5.0.0-RC1 and above prior to 5.9.21, theEntriesController::actionSaveEntry() performs entry-edit permission checks before request-controlled author changes are applied to the model, allowing for authorship spoofing. The subsequent author mutation path accepts attacker-supplied authors / author parameters and allows the change when the current user is one of the old authors. Because the controller does not re-run authorization after mutating the author list, a low-privileged user can reassign an entry’s authorship to another user without holding the dedicated peer-author-change permission. This issue has been fixed in version 5.9.21.

GHSA-qq2c-2q8j-jh27 — Craft CMS: Authorship spoofing in `entries/save-entry` via pre-check/post-mutation authorization gap

Affected: Packagist: craftcms/cms

### Summary

`EntriesController::actionSaveEntry()` performs entry-edit permission checks before request-controlled author changes are applied to the model. The subsequent author mutation path accepts attacker-supplied `authors` / `author` parameters and allows the change when the current user is one of the old authors. Because the controller does not re-run authorization after mutating the author list, a low-privileged user can reassign an entry’s authorship to another user without holding the dedicated peer-author-change permission.

### Details The control flow begins in [EntriesController.php](/D:/files/projects/cms-5.9.19/cms-5.9.19/src/controllers/EntriesController.php):249. `actionSaveEntry()` loads the entry and enforces edit permissions before calling `_populateEntryModel()`:

```php public function actionSaveEntry(bool $duplicate = false): ?Response { ... $entry = $this->_editableEntry($this->request->getBodyParam('entryId'), $siteId); ... $this->enforceEditEntryPermissions($entry, $duplicate); ... $this->_populateEntryModel($entry); ... $success = Craft::$app->getElements()->saveElement($entry); } ```

The attacker-controlled source is in [EntriesController.php](/D:/files/projects/cms-5.9.19/cms-5.9.19/src/controllers/EntriesController.php):588:

```php $entry->setAttributesFromRequest(array_filter([ 'authorIds' => $this->request->getBodyParam('authors') ?? $this->request->getBodyParam('author') ?? $entry->getAut…

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EUVD-2026-332208

fkie_cve-2026-50279

GHSA-qq2c-2q8j-jh27 — Craft CMS: Authorship spoofing in `entries/save-entry` via pre-check/post-mutation authorization gap