CVE-2025-23209
Craft CMS has a potential RCE with a compromised security key
Description
### 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
How to fix CVE-2025-23209
To remediate CVE-2025-23209, upgrade the affected package to a fixed version below.
- —upgrade to 5.5.8 or later
Is CVE-2025-23209 being exploited?
Yes — CVE-2025-23209 is on the CISA Known Exploited Vulnerabilities (KEV) catalog. Patch immediately.
Affected packages (1)
- >= 5.0.0-RC1, < 5.5.8
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.0 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H/E:H |