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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-33173 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  GitHub, Inc.
CVSS-B 5.3 MEDIUM
Vector:  CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d43b28dfaae7e53 GitHub, Inc.
https://github.com/rails/rails/commit/8fcb934caadc79c8cc4ce53287046d0f67005b3e GitHub, Inc.
https://github.com/rails/rails/commit/d9502f5214e2198245a4c1defe9cd02a7c8057d0 GitHub, Inc.
https://github.com/rails/rails/releases/tag/v7.2.3.1 GitHub, Inc.
https://github.com/rails/rails/releases/tag/v8.0.4.1 GitHub, Inc.
https://github.com/rails/rails/releases/tag/v8.1.2.1 GitHub, Inc.
https://github.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cg GitHub, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-925 Improper Verification of Intent by Broadcast Receiver GitHub, Inc.  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-33173
NVD Published Date:
03/23/2026
NVD Last Modified:
03/23/2026
Source:
GitHub, Inc.