CVE-2025-23209: Craft CMS has a potential RCE with a compromised security key

January 21, 2025

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.

References

craftcms.com/knowledge-base/securing-craft
github.com/advisories/GHSA-x684-96hh-833x
github.com/craftcms/cms
github.com/craftcms/cms/commit/e59e22b30c9dd39e5e2c7fe02c147bcbd004e603
github.com/craftcms/cms/security/advisories/GHSA-x684-96hh-833x
nvd.nist.gov/vuln/detail/CVE-2025-23209

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