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

HIGH 7.5EXPLOITED (CISA KEV)CVE-2021-39935 · Published 13/12/2021 · updated 17/06/2026

GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 03/02/2026. Patch affected systems as an emergency.

In short

CVE-2021-39935 is a HIGH (CVSS 7.5) vulnerability affecting gitlab (gitlab).
Exploited in the wild: CISA added it to the KEV catalog on 03/02/2026.
Chance of exploitation in the next 30 days (EPSS): 36.1%, higher than 98.5% of all vulnerabilities.
Fix: update to 14.3.6, 14.4.4, 14.5.2 or later.

Package	Affected versions	Patched versions
gitlab gitlab	`≥ 10.5.0, < 14.3.6≥ 14.4.0, < 14.4.4≥ 14.5.0, < 14.5.2`	`14.3.614.4.414.5.2`

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
hackerone.com/reports/1236965 · Permissions Required
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-39935

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Package

Affected versions

Patched versions

gitlab

≥ 10.5.0, < 14.3.6≥ 14.4.0, < 14.4.4≥ 14.5.0, < 14.5.2

14.3.614.4.414.5.2

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