Craft CMS: RCE via missing cleanseConfig in FieldsController::actionRenderCardPreview

Date Jul 9, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product Composer · craftcms/cms

High-risk advisory

Summary

Craft CMS: RCE via missing cleanseConfig in FieldsController::actionRenderCardPreview

Why it matters

GitHub has published a reviewed security advisory for craftcms/cms. Prioritize it with other application dependency updates.

Operator check

Check whether craftcms/cms is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 8.6.

Sources

GitHub Advisory GHSA-86vw-x4ww-x467 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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