What is GHSA-r8mr-vm79-xxh4?

GHSA-r8mr-vm79-xxh4 is a security advisory published by GitHub Security Advisories with High severity. Craft CMS 4.0.0 before 4.18.7 and 5.0.0 before 5.10.14 passes the raw 'updates' request parameter...

Which CVE IDs does GHSA-r8mr-vm79-xxh4 cover?

GHSA-r8mr-vm79-xxh4 covers the following CVE IDs: CVE-2026-109308. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-r8mr-vm79-xxh4?

GHSA-r8mr-vm79-xxh4 has a CVSS v3 base score of 8.8, published by GitHub Security Advisories.

GHSA-r8mr-vm79-xxh4HighCVSS 8.8

Craft CMS 4.0.0 before 4.18.7 and 5.0.0 before 5.10.14 passes the raw 'updates' request parameter...

Vendor

GitHub Security Advisories

Published

October 12, 2026

Last Modified

October 12, 2026

🔗 CVE IDs covered (1)

CVE-2026-109308 →

📋 Description

Craft CMS 4.0.0 before 4.18.7 and 5.0.0 before 5.10.14 passes the raw 'updates' request parameter in AppController::actionCacheUpdates to UpdatesModel without Component::cleanseConfig(), allowing behavior and event-handler injection. Authenticated control panel users with the performUpdates permission or Updates-utility access can supply 'as' or 'on' keys, such as an AttributeTypecastBehavior gadget, to execute arbitrary code.

🔗 References (4)

https://github.com/craftcms/cms/security/advisories/GHSA-5m2g-hhqr-84pc
https://nvd.nist.gov/vuln/detail/CVE-2026-109308
https://www.vulncheck.com/advisories/craft-cms-4.0.0-before-4.18.7-and-5.0.0-before-5.10.14-rce-via-actioncacheupdates-behavior-injection
https://github.com/advisories/GHSA-r8mr-vm79-xxh4