CVE-2026-33173Active Storage allows users to attach cloud and local files in Rails applications.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-925
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
rubyonrails rails rubyonrails:rails | before 7.2.3.1; from 8.0.0 before 8.0.4.1; from 8.1.0 before 8.1.2.1 | NVD |
References
- https://github.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d43b28dfaae7e53patch
- https://github.com/rails/rails/commit/8fcb934caadc79c8cc4ce53287046d0f67005b3epatch
- https://github.com/rails/rails/commit/d9502f5214e2198245a4c1defe9cd02a7c8057d0patch
- https://github.com/rails/rails/releases/tag/v7.2.3.1release-notes
- https://github.com/rails/rails/releases/tag/v8.0.4.1release-notes
- https://github.com/rails/rails/releases/tag/v8.1.2.1release-notes
- https://github.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cgvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.