CVE-2026-124430 Craft CMS 5.10.0 before 5.11.2 RCE via app/render-elements Signing Oracle

High 8.7 Published 8 Nov 2026 Updated 12 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-124430?

CVE-2026-124430 is a high-severity vulnerability in craftcms cms, published on 8 Nov 2026.

Official description

Craft CMS from 5.10.0 before 5.11.2 contains a remote code execution vulnerability that allows non-administrator control panel users to obtain HMAC-signed Twig templates via the app/render-elements endpoint. Attackers can submit the signed templated returnUrl as the login redirect parameter, triggering unsandboxed renderObjectTemplate() evaluation and executing OS commands as the PHP worker.

Weakness: CWE-1336

Which versions are affected by CVE-2026-124430?

How do I fix CVE-2026-124430?

No fix has been published for CVE-2026-124430 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-124430 being exploited?

There is no known exploitation of CVE-2026-124430 in the wild and no public exploit code.

Sources

Also known as GHSA-6pc2-3wgv-f5mj, GHSA-qj3q-j7r4-428p.