Craft CMS has a potential RCE with a compromised security key
CISA confirms exploitation of this vulnerability in real attacks. Prioritise checking whether your application is affected. CISA KEV · CC0 1.0
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
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | craftcms/cms | >= 5.0.0-RC1, < 5.5.8, >= 4.0.0-RC1, < 4.13.8 | 5.5.8, 4.13.8 |
References
- https://github.com/craftcms/cms/security/advisories/GHSA-x684-96hh-833x
- https://nvd.nist.gov/vuln/detail/CVE-2025-23209
- https://github.com/craftcms/cms/commit/e59e22b30c9dd39e5e2c7fe02c147bcbd004e603
- https://craftcms.com/knowledge-base/securing-craft#keep-your-secrets-secret
- https://github.com/craftcms/cms
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-23209
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H/E:H- Weakness (CWE)
CWE-94- Platform
- Composer
- Package
craftcms/cms- Disclosed
- 21.01.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-x684-96hh-833x - CC BY 4.0
Vulnerability history: craftcms/cms
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 127
- First → latest
- 07.2021 08.2026
- Without a fix
- 6
- Exploited in attacks
- 4
Severity breakdown
- Critical 9
- High 41
- Medium 65
- Low 12
Disclosures per year
- 2021: 3
- 2022: 22
- 2023: 13
- 2024: 9
- 2025: 6
- 2026: 74
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Craft CMS has a potential RCE with a compromised security key this entry
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