CVEvulnerability

CVE-2021-39935

7.5 HIGH Known exploited Published 2021-12-13 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

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

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.

Added to KEV: 2026-02-03
Remediation due: 2026-02-24
Ransomware use: Unknown
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes: https://about.gitlab.com/releases/2021/12/06/security-release-gitlab-14-5-2-released/ ; https://nvd.nist.gov/vuln/detail/CVE-2021-39935

Status: Analyzed
Published: 2021-12-13
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 6.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CVSS 3.1 ([email protected]): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0 ([email protected]): 5.0 MEDIUM — AV:N/AC:L/Au:N/C:P/I:N/A:N
Weaknesses: CWE-918

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

Affected configurations

• gitlab gitlab (>= 10.5.0 < 14.3.6) • gitlab gitlab (>= 14.4.0 < 14.4.4) • gitlab gitlab (>= 14.5.0 < 14.5.2)

Weakness · CWE (1)

CWE-918 Server-Side Request Forgery weakness

References