CVE-2021-39935

GitLab

Published 13 Dec 2021 · updated 17 Jun 2026 · Analyzed

7.5 High · CVSS 3.1, NVD

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 3 Feb 2026, with a remediation deadline of 24 Feb 2026 for US federal agencies.

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

Description

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

References

gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json · Third Party Advisory
gitlab.com/gitlab-org/gitlab/-/issues/346187 · Issue Tracking, Vendor Advisory
hackerone.com/reports/1236965 · Permissions Required, Third Party Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935 · US Government Resource