RCE in Craftcms Cms
CVE-2026-109308
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.
Vulnerability class: RCE (Remote Code Execution)
Published .
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
Weakness classification (CWE)
References
- github.com/craftcms/cms/security/advisories/GHSA-5m2g-hhqr-84pc (vendor-advisory)
- www.vulncheck.com/advisories/craft-cms-4.0.0-before-4.18.7-and-5.0.0-before-5.1… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109308?
- CVE-2026-109308 is a high-severity vulnerability in Craftcms Cms, classified under Code Injection. CVSS score: 8.8/10. Published 2026-10-12.
- How severe is CVE-2026-109308?
- High severity. CVSS v3 base score is 8.8 out of 10.