CVE-2021-39878 Cross-site scripting in GitLab

What is CVE-2021-39878?

CVE-2021-39878 is a medium-severity cross-site scripting vulnerability in Gitlab Gitlab, published on 5 Oct 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

A stored Reflected Cross-Site Scripting vulnerability in the Jira integration in GitLab version 13.0 up to 14.3.1 allowed an attacker to execute arbitrary javascript code.

Weakness: CWE-79

Which versions are affected by CVE-2021-39878?

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

Products include Gitlab Gitlab.

How do I fix CVE-2021-39878?

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

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-39878 being exploited?

There is no known exploitation of CVE-2021-39878 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-2021-39878, GHSA-352f-q892-q47q, UBUNTU-CVE-2021-39878.