What is CVE-2026-124430?

CVE-2026-124430 is a high-severity vulnerability in Craftcms Cms, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 8.8/10. Published 2026-11-08.

How severe is CVE-2026-124430?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Craftcms Cms

CVE-2026-124430

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.

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Craftcms Cms

Weakness classification (CWE)

CWE-1336 — Improper Neutralization of Special Elements Used in a Template Engine

References

GitHub Security Advisory (GHSA-qj3q-j7r4-428p) (vendor-advisory)
VulnCheck Advisory: Craft CMS 5.10.0 before 5.11.2 RCE via app/render-elements Signing Oracle (third-party-advisory)

Frequently asked questions

What is CVE-2026-124430?: CVE-2026-124430 is a high-severity vulnerability in Craftcms Cms, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 8.8/10. Published 2026-11-08.
How severe is CVE-2026-124430?: High severity. CVSS v3 base score is 8.8 out of 10.