CVE-2021-39904

Name: CVE-2021-39904
Creator: NVD / NIST
Published: 2021-11-05T00:15:10.847+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2021-39904 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An Improper Access Control vulnerability in the GraphQL API in all versions of GitLab CE/EE starting from 13.1 before 14.2.6, all versions starting from 14.3 before 14.3.4, and all versions starting from 14.4 before 14.4.1 allows a Merge Request creator to resolve discussions and apply suggestions after a project owner has locked the Merge Request. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

Description

An Improper Access Control vulnerability in the GraphQL API in all versions of GitLab CE/EE starting from 13.1 before 14.2.6, all versions starting from 14.3 before 14.3.4, and all versions starting from 14.4 before 14.4.1 allows a Merge Request creator to resolve discussions and apply suggestions after a project owner has locked the Merge Request

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

0.81%

52.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	>= 13.1.0, < 14.2.6
Gitlab	Gitlab	>= 14.3.0, < 14.3.4

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39904.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/295298Exploit, Issue Tracking, Vendor Advisory
https://hackerone.com/reports/1063420Permissions Required, Third Party Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39904.jsonVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/issues/295298Exploit, Issue Tracking, Vendor Advisory
https://hackerone.com/reports/1063420Permissions Required, Third Party Advisory

Timeline

Published: Nov 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39904?

How severe is CVE-2021-39904?

CVE-2021-39904 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39904?

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-2021-39904?

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

Scan your code now

Source: NVD / NIST