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GHSA-fxp3-g6gw-4r4vhigh8.6

Craft CMS: GraphQL Asset Mutation Privilege Escalation

Impact

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.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

craftcms/cms Packagist
Affected rangeRecorded fix
From 5.0.0-RC1 before 5.9.0-beta.1Ecosystem versions5.9.0-beta.1
From 4.0.0-RC1 before 4.17.0-beta.1Ecosystem versions4.17.0-beta.1

Version evidence: OSV · GHSA-fxp3-g6gw-4r4v

View original version evidence (374 explicit versions)

Original source description

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

References