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Vulnerability record · CVE-2026-33159 · published 24 March 2026

CVE-2026-33159: Craftcms craft cms missing authentication for critical function vulnerability

Craftcms · Craft Cms

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.

6.9 CVSS 4.0 Medium EPSS 0.43% · top 64.7% CWE-306 · Missing authentication for critical functionCWE-862 · Missing authorization
6.9CVSS 4.0 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/craftcms/cms/commit/7f0ead833f7c2b91ae12003caad833479dd08592 Patch
https://github.com/craftcms/cms/releases/tag/4.17.8 Release Notes
https://github.com/craftcms/cms/releases/tag/5.9.14 Release Notes
https://github.com/craftcms/cms/security/advisories/GHSA-6mrr-q3pj-h53w Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-33159), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.