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CVE-2021-39935

Medium CVSS 6.8 Known exploited

Published 2021-12-13 · last changed 2026-06-17 · added to CISA KEV 2026-02-03

This one is being exploited in the wild.

CISA added CVE-2021-39935 to the Known Exploited Vulnerabilities catalog on 2026-02-03. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2021-39935, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

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

Sources

CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N