CVE-2021-39935

Medium6.8Published on December 13, 2021

An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. Unauthorized external users could perform Server Side Requests via the CI Lint API

Actively exploited

In the CISA exploited-vulnerabilities catalogue since Feb 3, 2026
US federal agencies must remediate it by Feb 24, 2026 (BOD 22-01)
First attack observed 1183 days after disclosure
Confirmed by sensors, not only by reports

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Source: CISA KEV · Feb 3, 2026 Mar 11, 2025

CVSS score6.8 / 10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Weakness type (CWE)CWE-918, CWE-918

Vendorsgitlab