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CVE-2026-33173

5.3 · MEDIUM

Active Storage allows users to attach cloud and local files in Rails applications.

Published Mar 24, 2026CWE-925EPSS 0.39%

Overview

CVE-2026-33173 is a medium-severity vulnerability. It was published on March 24, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d43b28dfaae7e53GitHubgithub.com/rails/rails/commit/8fcb934caadc79c8cc4ce53287046d0f67005b3eGitHubgithub.com/rails/rails/commit/d9502f5214e2198245a4c1defe9cd02a7c8057d0GitHubgithub.com/rails/rails/releases/tag/v7.2.3.1GitHubgithub.com/rails/rails/releases/tag/v8.0.4.1GitHubgithub.com/rails/rails/releases/tag/v8.1.2.1GitHubgithub.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-33173?

CVE-2026-33173 is a medium-severity vulnerability. It was published on March 24, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-33173?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-33173?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-33173?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-33173 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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