5.3
Medium
CVE-2026-33173 Active Storage allows users to attach cloud and local files in Rails applications
Description
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 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 direct-upload client can set these flags to skip MIME detection and analysis. This allows an attacker to upload arbitrary content while claiming a safe `content_type`, bypassing any validations that rely on Active Storage's automatic content type identification. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| activestorage 8.1 | 8.1.0.beta1 → < 8.1.2.1 | 8.1.2.1 |
| activestorage 8.0 | 8.0.0.beta1 → < 8.0.4.1 | 8.0.4.1 |
| activestorage 7.2 | earliest → < 7.2.3.1 | 7.2.3.1 |
References
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified
Other CVEs of activestorage
The 6 CVEs of activestorage →
CVE-2026-33658
Active Storage allows users to attach cloud and local files in Rails applications
2.3
Low
CVE-2026-33202
Active Storage allows users to attach cloud and local files in Rails applications
6.6
Medium
CVE-2026-33195
Active Storage allows users to attach cloud and local files in Rails applications
8.0
High
CVE-2026-33174
Active Storage allows users to attach cloud and local files in Rails applications
6.6
Medium