CVE-2026-25497
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. ## 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
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | craftcms/cms | >= 5.0.0-RC1, < 5.9.0-beta.1 | 5.9.0-beta.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Craftcms | Craft Cms | after 4.0.0 before 4.17.0 after 5.0.0 before 5.9.0 Versions 4.0.0, 5.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/craftcms/cms/commit/ac7edf868c1a81fd9c4dc49d3b3edf1cce113409
- https://github.com/craftcms/cms/releases/tag/5.8.22
- https://github.com/craftcms/cms/security/advisories/GHSA-fxp3-g6gw-4r4v
- https://github.com/advisories/GHSA-fxp3-g6gw-4r4v
- https://github.com/craftcms/cms/releases/tag/4.17.0-beta.1
- https://github.com/craftcms/cms/releases/tag/5.9.0-beta.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-25497