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CVE-2026-33173

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/24/2026

Last Modified3/24/2026

Sourcenvd

Honeypot Sightings0

Affected Products

rubyonrails:rails

Weaknesses (CWE)

CWE-925

References

https://github.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d43b28dfaae7e53(security-advisories@github.com)

https://github.com/rails/rails/commit/8fcb934caadc79c8cc4ce53287046d0f67005b3e(security-advisories@github.com)

https://github.com/rails/rails/commit/d9502f5214e2198245a4c1defe9cd02a7c8057d0(security-advisories@github.com)

https://github.com/rails/rails/releases/tag/v7.2.3.1(security-advisories@github.com)

https://github.com/rails/rails/releases/tag/v8.0.4.1(security-advisories@github.com)

https://github.com/rails/rails/releases/tag/v8.1.2.1(security-advisories@github.com)

https://github.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cg(security-advisories@github.com)

IOC Correlations

No correlations recorded

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