Craft CMS has a potential RCE with a compromised security key
### Impact This is an RCE vulnerability that affects Craft 4 and 5 installs where your security key has already been compromised. https://craftcms.com/knowledge-base/securing-craft#keep-your-secrets-secret Anyone running an unpatched version of Craft with a compromised security key is affected. ### Patches This has been patched in Craft 5.5.8 and 4.13.8. ### Workarounds If you can't update to a patched version, then rotating your security key and ensuring its privacy will help to migitgate the issue. ### References https://github.com/craftcms/cms/commit/e59e22b30c9dd39e5e2c7fe02c147bcbd004e603
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-23209US | high8.1OT critical | KEV | ||
Craft is a flexible, user-friendly CMS for creating custom digital experiences on the web and beyond. This is an remote code execution (RCE) vulnerability that affects Craft 4 and… | ||||
references
External citations — patches, advisories, analysis.
- https://craftcms.com/knowledge-base/securing-craft#keep-your-secrets-secretWEB
- https://github.com/craftcms/cmsPACKAGE
- https://github.com/craftcms/cms/commit/e59e22b30c9dd39e5e2c7fe02c147bcbd004e603WEB
- https://github.com/craftcms/cms/security/advisories/GHSA-x684-96hh-833xWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-23209ADVISORY
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-23209WEB
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