CVE-2021-39945

Improper access control in the GitLab CE/EE API affecting all versions starting from 9.4 before...

2.7 LowFix available

Improper access control in the GitLab CE/EE API affecting all versions starting from 9.4 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2, allows an author of a Merge Request to approve the Merge Request even after having their project access revoked

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

0.94%Up 0.1 points since Dec 13, 2021

What each source reports

CVE List Score used 2.7

Record: CVE-2021-39945
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

EUVDEUVD-2021-26301 2.7

Record: EUVD-2021-26301
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-3cm3-9ccj-7mvq No score

Improper access control in the GitLab CE/EE API affecting all versions starting from 9.4 before...

Record: GHSA-3cm3-9ccj-7mvq
Weakness: CWE-863
Updated: 2026-11-02

NVD 2.7

Record: CVE-2021-39945
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
CVSS 2.0: 4.0 MediumAV:N/AC:L/Au:S/C:N/I:P/A:N
Weakness: CWE-863
Updated: 2026-11-02

OSV 2.7

Record: CVE-2021-39945
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-39945 2.7

Record: UBUNTU-CVE-2021-39945
CVSS 3.1: 2.7 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

OSVBIT-gitlab-2021-39945 No score

Record: BIT-gitlab-2021-39945
Updated: 2026-11-02

Affected products

gitlab

Affected packages

Affected packages
Package	Affected	Fixed
`gitlab` Bitnami	9.4.0 up to 14.3.6, 14.4.0 up to 14.4.4, 14.5.0 up to 14.5.2	14.3.614.4.414.5.2
`gitlab` Ubuntu:16.04:LTS	All versions, plus listed versions 8.4.3+dfsg-98.4.3+dfsg-128.5.8+dfsg-5	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-39945 is a low vulnerability (CVSS 2.7) in Gitlab, published December 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.94%, the 61st percentile. Fixed in gitlab 14.3.6.