Craft CMS: GraphQL Asset Mutation Privilege Escalation
Date: 2026-02
Affected: composer/craftcms/cms, composer/craftcms/cms
Attack vector: data-exfiltration
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-25497
CWE: CWE-269
CWE-639

There is a Privilege Escalation vulnerability in Craft CMS’s GraphQL API that allows an authenticated user with write access to one asset volume to escalate their privileges and modify/transfer assets belonging to any other volume, including restricted or private volumes to which they should not have access. ## Summary: Type: Privilege Escalation (CWE-269) Affected: Craft CMS 5.x (likely affects 4.x and 3.x as well) Location: `src/gql/resolvers/mutations/Asset.php lines 57-107` ## Root Cause: The saveAsset GraphQL mutation validates authorization against the schema-resolved volume but fetches the target asset by ID without verifying that the asset belongs to the authorized volume. This allows unauthorized cross-volume asset modification and transfer. ## Impact: - Transfer confidential assets from private volumes to public volumes (data exfiltration) - Modify asset metadata in restricted volumes - Bypass multi-tenant isolation in shared hosting environments


Mitigations:

Architectural layers (MAESTRO):