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Actively exploited

CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability

GitLab Community and Enterprise Editions contain a server-side request forgery vulnerability which could allow unauthorized external users to perform Server Side Requests via the CI Lint API.

From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.

Our Assessment

Should You Worry?

Patch nowCybergen assessment
  • CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 3 Feb 2026.
  • Rated Medium severity (CVSS 6.8, scored by Vendor).
  • This product type is often exposed to the internet, which is where attackers scan for it first.
  • It has been in the catalogue for 276 days. Systems still unpatched now have almost certainly been scanned for it.
The Vulnerability

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

Affected Versions

ProductVersions
GitLab GitLab>=10.5, <14.3.6
>=14.4, <14.4.4
>=14.5, <14.5.2

From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.

From Watch to Action

What To Do Now

  1. 1

    Find it

    Search your asset inventory and external attack surface for GitLab Community and Enterprise Editions. Include cloud images, appliances and anything a supplier runs for you.

    Attack Surface Management
  2. 2

    Fix it

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

    Vulnerability Management
  3. 3

    Hunt for compromise

    If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.

    Incident Response
  4. 4

    Prove it is fixed

    Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.

    Penetration Testing

Vendor Advisories

Regulation

The Compliance Clock

Cyber EssentialsCyber Essentials requires high and critical updates (CVSS 7.0 or above) within 14 days of release. Treat any exploited flaw the same way.NIS2If exploitation causes a significant incident, essential and important entities owe their CSIRT an early warning within 24 hours and a notification within 72 hours.DORAFinancial entities must classify ICT incidents and send an initial notification for a major incident within strict deadlines, with exploited flaws a common cause.US federal (BOD 22-01)Federal civilian agencies had until 24 Feb 2026 to remediate. A sensible benchmark for everyone else.

General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.

Stay Ahead

More Exploited GitLab Flaws

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CVE-2026-97229GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound VulnerabilityAdded 29 Oct 2026CVE-2026-85706GitLab Community Edition and Enterprise Edition Path Traversal VulnerabilityAdded 11 Sep 2026CVE-2021-22175GitLab Server-Side Request Forgery (SSRF) VulnerabilityAdded 18 Feb 2026CVE-2023-7028GitLab Community and Enterprise Editions Improper Access Control VulnerabilityAdded 1 May 2024CVE-2021-22205 · RansomwareGitLab Community and Enterprise Editions Remote Code Execution VulnerabilityAdded 3 Nov 2021

All 6 exploited GitLab vulnerabilities

Not Sure If You Are Exposed?

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Evidence

Sources

  1. CISA Known Exploited Vulnerabilities catalogue
  2. NVD: CVE-2021-39935
  3. CVE record: CVE-2021-39935
  4. FIRST EPSS
  5. about.gitlab.com/releases/2021/12/06/security-release-gitlab-14-5-2-released/
  6. gitlab.com/gitlab-org/gitlab/-/issues/346187
  7. hackerone.com/reports/1236965
  8. gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json