Rails Active Storage has possible content type bypass via metadata in direct uploads
### Impact Active Storage's `DirectUploadsController` accepts arbitrary metadata from the client and persists it on the blob. Because internal flags like `identified` and `analyzed` are stored in the same metadata hash, a malicious direct-upload client could set these flags. ### Releases The fixed releases are available at the normal locations. ### Credit This was responsible reported by Hackerone researcher [pwnie](https://hackerone.com/pwnie)
01
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-33173US | medium5.3 | — | ||
Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, `DirectUploadsController` accepts arbitrary meta… | ||||
02
references
External citations — patches, advisories, analysis.
- https://github.com/rails/railsPACKAGE
- https://github.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d43b28dfaae7e53WEB
- https://github.com/rails/rails/commit/8fcb934caadc79c8cc4ce53287046d0f67005b3eWEB
- https://github.com/rails/rails/commit/d9502f5214e2198245a4c1defe9cd02a7c8057d0WEB
- https://github.com/rails/rails/releases/tag/v7.2.3.1WEB
- https://github.com/rails/rails/releases/tag/v8.0.4.1WEB
- https://github.com/rails/rails/releases/tag/v8.1.2.1WEB
- https://github.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cgWEB
scry
Advisories like this name the exposed products attackers go after on your perimeter. See what is exposed on your perimeter with a free passive scan.
Free scan