What’s Vulnerable › Vulnerabilities

CVE-2021-39903

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-04 · updated 2026-06-17

Description

In all versions of GitLab CE/EE since version 13.0, a privileged user, through an API call, can change the visibility level of a group or a project to a restricted option even after the instance administrator sets that visibility option as restricted in settings.

Affected products

• GitLab: from 13.0.0 before 14.2.6; from 14.3.0 before 14.3.4; 14.4.0 — 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-2021-39903.json
• https://gitlab.com/gitlab-org/gitlab/-/issues/300017
• https://hackerone.com/reports/1086781
• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39903.json
• https://gitlab.com/gitlab-org/gitlab/-/issues/300017
• https://hackerone.com/reports/1086781

Get alerted when CVE-2021-39903 or the next vulnerability affects your stack