IRONSMITHINTEL
MEDIUMCVSS6.8
|
Actively Exploited
|CISA KEV|CVE-2021-39935|Auth: none — unauthenticated|Reboot: required|Manual only

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.

Published Dec 13, 2021 · Updated May 16, 2026
Why patchRisk explained in plain English
Worst-case scenarioIf unpatched

A remote attacker, without authentication, can achieve full data confidentiality loss. Federal agencies are required to remediate by 2026-02-24 under CISA BOD 22-01.

How the attack worksNo clicks needed

This is a Server-Side Request Forgery (SSRF) (CWE-918) vulnerability in GitLab Community and Enterprise Editions. 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 Exploitation requires remote network access, higher attack complexity, no authentication required, and no user interaction required.

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Phishing link

→

🖼

Malicious file

🔓

Server compromised

Am I affected?Quick check

Probably yes if any of these apply:

●IT Security
●Running gitlab: 10.5.0 ≤ v < 14.3.6, 14.4.0 ≤ v < 14.4.4, 14.5.0 ≤ v < 14.5.2
Real-world incidentsWhat we've seen

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2026-02-03 based on evidence of active exploitation in the wild. Federal agencies required to remediate by 2026-02-24.

How to patch

Manual remediation steps

Apply the Vendor Patch

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog — apply the vendor's security update as soon as possible.

CISA 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.

References

    1
    Vendor advisory: https://about.gitlab.com/releases/2021/12/06/security-release-gitlab-14-5-2-released/
    1
    NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2021-39935
    1
    CISA KEV: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935
PowerShell automationComing soon

No tested PowerShell script for this entry yet. We’re prioritising automation based on user demand.

References

↗ CVE-2021-39935↗ NVD↗ Vendor Advisory