What’s Vulnerable › Vulnerabilities

CVE-2021-39876

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-03-28 · updated 2026-06-17
• Weakness: CWE-863

Description

In all versions of GitLab CE/EE since version 11.3, the endpoint for auto-completing Assignee discloses the members of private groups.

Affected products

• GitLab: from 11.3 before 14.1.7; from 11.3.0 before 14.1.7; from 14.2 before 14.2.5; from 14.3.0 before 14.3.1 — fixed in 14.1.7, 14.2.5, 14.3.1

How to fix

Upgrade to a fixed version: GitLab 14.1.7, 14.2.5, 14.3.1. Check the vendor advisory for mitigations.

References

• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39876.json
• https://gitlab.com/gitlab-org/gitlab/-/issues/29683
• https://hackerone.com/reports/627507
• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39876.json
• https://gitlab.com/gitlab-org/gitlab/-/issues/29683
• https://hackerone.com/reports/627507

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