CVE-2021-39935

6.8 MEDIUM CISA KEV - Actively Exploited
Published: December 13, 2021 Modified: February 04, 2026
View on NVD

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

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json
Source: cve@gitlab.com
Third Party Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/346187
Source: cve@gitlab.com
Issue Tracking Vendor Advisory
https://hackerone.com/reports/1236965
Source: cve@gitlab.com
Permissions Required Third Party Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/346187
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking Vendor Advisory
https://hackerone.com/reports/1236965
Source: af854a3a-2127-422b-91ae-364da2661108
Permissions Required Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
US Government Resource

7 reference(s) from NVD

Quick Stats

CVSS v3 Score
6.8 / 10.0
EPSS (Exploit Probability)
54.3%
98th percentile
Exploitation Status
Actively Exploited
Remediation due: 2026-02-24

Weaknesses (CWE)

CWE-918 CWE-918

Affected Vendors

gitlab

Related CVEs

CVE-2026-4472 6.3
CVE-2026-4471 4.7
CVE-2026-4470 4.7
CVE-2026-4469 4.7
CVE-2026-33035 N/A