CVE-2026-50279 – Craft CMS: Authorship spoofing in `entries/save-entry` via pre-check/post-mutation authorization gap

CVE ID :CVE-2026-50279

Published : July 1, 2026, 11:31 p.m. | 15 minutes ago

Description :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.

Severity: 0.0 | NA

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