CVE-2021-39918

Name: CVE-2021-39918
Creator: NVD / NIST
Published: 2021-12-13T16:15:08.97+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.74%

Last modified Jun 17, 2026

CVE-2021-39918 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Incorrect Authorization in GitLab EE affecting all versions starting from 11.1 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 a user to add comments to a vulnerability which cannot be accessed.. EPSS estimates a 0.74% chance of exploitation in the next 30 days.

Description

Incorrect Authorization in GitLab EE affecting all versions starting from 11.1 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 a user to add comments to a vulnerability which cannot be accessed.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.74%

49.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	>= 11.1.0, < 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-2021-39918.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/329916Broken Link
https://hackerone.com/reports/1180043Permissions Required, Third Party Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39918.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/329916Broken Link
https://hackerone.com/reports/1180043Permissions Required, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-39918?

How severe is CVE-2021-39918?

CVE-2021-39918 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.74% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39918?

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-2021-39918?

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

Scan your code now

Source: NVD / NIST