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GHSA-3pvf-vxrv-hh9c

Craft CMS: Low-privilege users could read private asset contents when editing an asset (IDOR)

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-33158

Packages

EcosystemPackageAffectedFixed in
Packagist craftcms/cms >= 4.0.0-RC1, < 4.17.8 4.17.8
Packagist craftcms/cms >= 5.0.0-RC1, < 5.9.14 5.9.14

Details

As written in the advisory (Markdown source, shown as plain text).

### Summary A low-privileged authenticated user can read private asset content by calling `assets/edit-image` with an arbitrary `assetId` that they are not authorized to view. The endpoint returns image bytes (or a preview redirect) without enforcing a per-asset view authorization check, leading to potential unauthorized disclosure of private files. ### Details Root cause: - A user-controlled object reference (`assetId`) is used to load and return sensitive content. - The action does not verify whether the current user is authorized to view that asset. - This creates an authenticated IDOR / authorization bypass. ### Impact - Craft installations where private/non-public assets exist and low-privileged users can authenticate. ## Resources https://github.com/craftcms/cms/commit/7290d91639e

References

External links from the advisory. They lead to third-party sites.