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

published 2026-10-23 20d ago modified 2026-11-10 yesterday also EUVD-2026-119570 , GHSA-qj3q-j7r4-428p

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository craftcms/cms. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

craftcms cms 5.11.2

Is CVE-2026-124430 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

craftcms cms

Classification

Weakness

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

References

github.com /craftcms/cms/security/advisories/GHSA-qj3q-j7r4-428p
vendor-advisory, advisory
vulncheck.com /advisories/craft-cms-5.10.0-before-5.11.2-rce-via-app-render-elements-signing-oracle
third-party-advisory

Sources

CVE List CVE-2026-124430
NVD CVE-2026-124430
Maintainer advisory GHSA-qj3q-j7r4-428p

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of craftcms/cms published their own advisory on GitHub. Reviewed sources take precedence over it.