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

criticalknown exploitedpublic exploitCVE-2021-39935
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: GitLabproduct: Community and Enterprise EditionsServer-side request forgery
What
A server-side request forgery vulnerability could allow unauthorized external users to perform server-side requests.
Who is affected
Deployments of GitLab Community and Enterprise Editions.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Upgrade to the latest version of GitLab.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-02-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-39935

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-39935coverage & exploitation statusNVD · CVE.org

Recent advisories for GitLab Community and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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