CVE-2021-39889 Information disclosure in GitLab

What is CVE-2021-39889?

CVE-2021-39889 is a medium-severity vulnerability in Gitlab Gitlab, published on 5 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

In all versions of GitLab EE since version 14.1, due to an insecure direct object reference vulnerability, an endpoint may reveal the protected branch name to a malicious user who makes a crafted API call with the ID of the protected branch.

Weakness: CWE-639

Which versions are affected by CVE-2021-39889?

1 open source package ship an affected version, including gitlab. It affects 1 product.

Products include Gitlab Gitlab.

How do I fix CVE-2021-39889?

Upgrade gitlab to a fixed version for your release line: 14.1.7, 14.2.5 or 14.3.1.

Is CVE-2021-39889 being exploited?

There is no known exploitation of CVE-2021-39889 in the wild and no public exploit code.

Other vulnerabilities in Gitlab Gitlab

• CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound Exploited Critical 10.0
• CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal Exploited Critical 10.0
• CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control Exploited Critical 10.0
• CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution Exploited Critical 10.0
• CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Exploited Medium 6.8

All Gitlab Gitlab vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-gitlab-2021-39889, GHSA-7w9g-7w46-w7h4, UBUNTU-CVE-2021-39889.