# CVE-2021-39935

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

- Page: https://www.vulneraibility.com/cve/CVE-2021-39935
- CVSS: 6.8
- Known exploited: yes, in CISA KEV since 2026-02-03; CISA due date 2026-02-24
- EPSS: 36.14%
- CISA SSVC: exploitation active, automatable no, technical impact partial (assessed 2026-02-03)
- Weakness: CWE-918
- Published: 2021-12-13

## Affected versions

- GitLab: affected >= 10.5 and < 14.3.6; >= 14.4 and < 14.4.4; >= 14.5 and < 14.5.2

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://gitlab.com/gitlab-org/gitlab/-/issues/346187
- [other] https://hackerone.com/reports/1236965
- [other] https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.