HOMEVULNERABILITIESCVE-2026-33173
MEDIUM

CVE-2026-33173

CWE-925Published: March 24, 2026· Updated: Mar 24, 2026

5.3
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:1.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33173 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

rubyonrails1 product
rails
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d43b28dfaae7e53
PATCHhttps://github.com/rails/rails/commit/8fcb934caadc79c8cc4ce53287046d0f67005b3e
PATCHhttps://github.com/rails/rails/commit/d9502f5214e2198245a4c1defe9cd02a7c8057d0
ADVISORYhttps://github.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cg

All References (7)

→
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

Quick Facts

CVE IDCVE-2026-33173
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-925
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMar 24, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33173 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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