CVE-2026-112772: Craft CMS 5.0.0 before 5.11.0 RCE via Asset::getMimeType Transform Injection

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-19 · updated 2026-10-20
Weakness: CWE-94

Description

Craft CMS from 5.0.0 before 5.11.0 contains a remote code execution vulnerability that allows authenticated Control Panel users to escape the Twig sandbox via Asset::getMimeType transforms. Attackers can supply 'as' or 'on' keys passed unfiltered to Craft::createObject, attaching malicious behaviors or event handlers that execute code as the web user.

Affected products

craftcms cms: from 5.0.0 before 5.11.0 — fixed in 5.11.0

How to fix

Upgrade to a fixed version: craftcms cms 5.11.0. Check the vendor advisory for mitigations.

References

https://github.com/craftcms/cms/security/advisories/GHSA-qm9x-rmcj-h2rc
https://www.vulncheck.com/advisories/craft-cms-5.0.0-before-5.11.0-rce-via-asset-getmimetype-transform-injection

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