Vulnerability in Rails Activestorage

CVE-2026-33173

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 i…

EPSS: 0.004 (31.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-33173?
CVE-2026-33173 is a medium-severity vulnerability in Rails Activestorage, classified under CWE-925. CVSS score: 5.3/10. Published 2026-03-24.
How severe is CVE-2026-33173?
Medium severity. CVSS v3 base score is 5.3 out of 10.