CVE-2026-33159

Name: CVE-2026-33159
Creator: NVD / NIST
Published: 2026-03-24T18:16:09.907+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.9/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2026-33159 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. 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. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS 4.0

6.9/10

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:X/V:X/RE:X/U:X

EPSS Probability

0.31%

22.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Craftcms	Craft Cms	> 4.0.0, < 4.17.8
Craftcms	Craft Cms	> 5.0.0, < 5.9.14
Craftcms	Craft Cms	4.0.0
Craftcms	Craft Cms	5.0.0

References

https://github.com/craftcms/cms/commit/7f0ead833f7c2b91ae12003caad833479dd08592Patch
https://github.com/craftcms/cms/releases/tag/4.17.8Release Notes
https://github.com/craftcms/cms/releases/tag/5.9.14Release Notes
https://github.com/craftcms/cms/security/advisories/GHSA-6mrr-q3pj-h53wVendor Advisory

Timeline

Published: Mar 24, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33159?

How severe is CVE-2026-33159?

CVE-2026-33159 has a CVSS score of 6.9/10 (MEDIUM severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33159?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33159?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST