CVE-2021-39904

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-11-05 · updated 2026-06-17
Weakness: CWE-863

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

Affected products

GitLab: from 13.1.0 before 14.2.6; from 14.3.0 before 14.3.4 — fixed in 14.2.6, 14.3.4

How to fix

Upgrade to a fixed version: GitLab 14.2.6, 14.3.4. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39904.json
https://gitlab.com/gitlab-org/gitlab/-/issues/295298
https://hackerone.com/reports/1063420
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39904.json
https://gitlab.com/gitlab-org/gitlab/-/issues/295298
https://hackerone.com/reports/1063420

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