Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M

CVE-2026-33159Craft CMS: Unauthenticated users could execute project configuration sync operations that should be restricted trusted users

Medium 6.9

In plain English

A medium-severity missing authentication in cms from craftcms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.4%top 68.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Craft CMS is a content management system (CMS). From version 4.0.0-RC1 to before version 4.17.8 and from version 5.0.0-RC1 to before version 5.9.14, guest users can access Config Sync updater index, obtain signed data, and execute state-changing Config Sync actions (regenerate-yaml, apply-yaml-changes) without authentication. This issue has been patched in versions 4.17.8 and 5.9.14.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	craftcms/cms	5.9.14	GHSA-6mrr-q3pj-h53w
Packagist	craftcms/cms	4.17.8	GHSA-6mrr-q3pj-h53w

Affected products (as reported)

Vendor	Product	Versions
craftcms	cms	>= 4.0.0-RC1, < 4.17.8>= 5.0.0-RC1, < 5.9.14

Weakness: CWE-306, CWE-862 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/craftcms/cms/security/advisories/GHSA-6mrr-q3pj-h53w x_refsource_CONFIRM
https://github.com/craftcms/cms/commit/7f0ead833f7c2b91ae12003caad833479dd08592 x_refsource_MISC
https://github.com/craftcms/cms/releases/tag/4.17.8 x_refsource_MISC
https://github.com/craftcms/cms/releases/tag/5.9.14 x_refsource_MISC