What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.6 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-02 · updated 2026-10-25
• Weakness: CWE-285

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.

Affected products

• craftcms cms: from 5.0.0-RC1, < 5.9.21

References

• 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

Get alerted when CVE-2026-50279 or the next vulnerability affects your stack