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 5 installs where your security key has already been compromised. Anyone running an unpatched version of Craft with a compromised security key is affected. This vulnerability has been patched in Craft 5.5.8 and 4.13.8. Users who cannot update to a patched version, should rotate their security keys and ensure their privacy to help migitgate the issue.
Use CWE-94, Craftcms vendor hub and Craft Cms product page to widen CVE-2025-23209 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-33157, CVE-2026-32264 and CVE-2026-32263 for nearby disclosures in the same product family.