Is CVE-2026-109308 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-109308?

CVE-2026-109308 has a CVSS v3 severity of HIGH (8.8).

Back

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.