CVE-2021-39945

Name: CVE-2021-39945
Creator: NVD / NIST
Published: 2021-12-13T16:15:09.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 2.7/10EPSS 0.91%

Last modified Jun 17, 2026

CVE-2021-39945 is a low-severity vulnerability rated 2.7/10 on the CVSS scale. 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. EPSS estimates a 0.91% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

2.7/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.91%

55.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	>= 9.4.0, < 14.3.6
Gitlab	Gitlab	>= 14.4.0, < 14.4.4
Gitlab	Gitlab	>= 14.5.0, < 14.5.2

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39945.jsonThird Party Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/331675Broken Link
https://hackerone.com/reports/1198317Permissions Required, Third Party Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39945.jsonThird Party Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/331675Broken Link
https://hackerone.com/reports/1198317Permissions Required, Third Party Advisory

Timeline

Published: Dec 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39945?

How severe is CVE-2021-39945?

CVE-2021-39945 has a CVSS score of 2.7/10 (LOW severity). The EPSS model estimates a 0.91% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39945?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39945?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST