CVE-2026-33173

CWE-925CWE-12878 documents7 sources
Severity
5.3MEDIUM
EPSS
0.0%
top 97.72%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Rails ActivestorageRubyonrails Rails
Timeline
PublishedMar 24

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`, bypass…

CVSS 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

Affected Packages3 packages

▶CVEListV5rails/activestorage< 7.2.3.1+2
▶RubyGemsactivestorage8.1.0.beta1 — 8.1.2.1+2
▶NVDrubyonrails/rails8.0.0 — 8.0.4.1+2

Patches

Patch: github.com ↗Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

4
OSV
CVE-2026-33173: Active Storage allows users to attach cloud and local files in Rails applications↗2026-03-24
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CVEList
Rails Active Storage has possible content type bypass via metadata in direct uploads↗2026-03-23
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OSV
Rails Active Storage has possible content type bypass via metadata in direct uploads↗2026-03-23
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GHSA
Rails Active Storage has possible content type bypass via metadata in direct uploads↗2026-03-23
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📋Vendor Advisories

2
Red Hat
Rails: Active Storage: Rails Active Storage: Content type bypass via arbitrary metadata in direct uploads↗2026-03-23
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Debian
CVE-2026-33173: rails - Active Storage allows users to attach cloud and local files in Rails application...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-33173 Impact, Exploitability, and Mitigation Steps | Wiz↗
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