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.

• CWE-285

• https://github.com/craftcms/cms/commit/9cc493be8b414d7116c7f2bc2a6d0926e73f1248
• https://github.com/craftcms/cms/security/advisories/GHSA-qq2c-2q8j-jh27
• https://github.com/craftcms/cms/security/advisories/GHSA-qq2c-2q8j-jh27

Published

Jul 2, 2026

Last Modified

Jul 2, 2026

Status

Deferred

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