GHSA-x684-96hh-833x

Craft CMS has a potential RCE with a compromised security key

Source: GitHub Advisory Database (reviewed) High CVE-2025-23209

Packages

Ecosystem	Package	Affected	Fixed in
Packagist	craftcms/cms	>= 5.0.0-RC1, < 5.5.8	5.5.8
Packagist	craftcms/cms	>= 4.0.0-RC1, < 4.13.8	4.13.8

Details

As written in the advisory (Markdown source, shown as plain text).

### 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

References

External links from the advisory. They lead to third-party sites.