CVE-2026-109308

High

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.

SeverityHigh

CVSS8.8

Exploit probability—

ProductCms

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-94Code injection

How to fix

Update

craftcms cms4.18.7, 5.10.14 or later

Vendor advisories

github.com/craftcms/cms/security/advisories/GHSA-5m2g-hhqr-84pc

Affected products

Product	Affected versions	Fixed in
craftcms cms	4.0.0 ≤ v < 4.18.7, 5.0.0 ≤ v < 5.10.14	4.18.7, 5.10.14

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

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