What’s Vulnerable › Vulnerabilities

CVE-2021-39909

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-05 · updated 2026-06-17
• Weakness: CWE-347

Description

Lack of email address ownership verification in the CODEOWNERS feature in all versions of GitLab EE starting from 11.3 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 an attacker to bypass CODEOWNERS Merge Request approval requirement under rare circumstances

Affected products

• GitLab: from 11.3.0 before 14.2.6; from 14.3.0 before 14.3.4; from 11.2.0 before 14.3.4; from 11.3.0 before 14.4.1; 14.4.0 — fixed in 14.2.6, 14.3.4, 14.4.1

How to fix

Upgrade to a fixed version: GitLab 14.2.6, 14.3.4, 14.4.1. Check the vendor advisory for mitigations.

References

• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39909.json
• https://gitlab.com/gitlab-org/gitlab/-/issues/335191
• https://hackerone.com/reports/1237750
• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39909.json
• https://gitlab.com/gitlab-org/gitlab/-/issues/335191
• https://hackerone.com/reports/1237750

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