CVE-2021-39935
MEDIUM KEVGitLab 10.5-14.3.5, 14.4-14.4.3, 14.5-14.5.1 - Unauthenticated Server-Side Request Forgery via CI Lint API
Title source: llmExploitation Summary
CVE-2021-39935 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added February 3, 2026.
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 (4)
Core 4
Core References
Issue Tracking, Vendor Advisory x_refsource_misc
https://gitlab.com/gitlab-org/gitlab/-/issues/346187
Permissions Required, Third Party Advisory x_refsource_misc
https://hackerone.com/reports/1236965
Third Party Advisory x_refsource_confirm
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json
US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935
Scores
CVSS v3
6.8
EPSS
0.6453
EPSS Percentile
98.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
active
Automatable
no
Technical Impact
partial
Details
CISA KEV
2026-02-03
VulnCheck KEV
2025-03-11
ENISA EUVD
EUVD-2021-26291
CWE
CWE-918
Status
published
Products (1)
gitlab/gitlab
10.5.0 - 14.3.6 (2 CPE variants)
Published
Dec 13, 2021
KEV Added
Feb 03, 2026
Tracked Since
Feb 18, 2026