CVE-2026-5816 Improper Resolution of Path Equivalence in GitLab

High 8.0 Published 22 Apr 2026 Updated 23 Apr 2026

Unauthenticated attackers can execute arbitrary JavaScript in user sessions via improper path validation, potentially leading to account takeover.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2026-5816?

CVE-2026-5816 is a high-severity cross-site scripting vulnerability in Gitlab Gitlab, published on 22 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.10 before 18.10.4 and 18.11 before 18.11.1 that could have allowed an unauthenticated user to execute arbitrary JavaScript in a user's browser session due to improper path validation under certain conditions.

Weakness: CWE-41

Which versions are affected by CVE-2026-5816?

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

Package	Affected	Fixed in
`gitlab` Bitnami	From `18.10.0`	`18.10.4, 18.11.1`

Products include Gitlab Gitlab.

How do I fix CVE-2026-5816?

Upgrade gitlab to a fixed version for your release line: 18.10.4 or 18.11.1.

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-2026-5816 being exploited?

There is no known exploitation of CVE-2026-5816 in the wild and no public exploit code.

All Gitlab Gitlab vulnerabilities

Sources

Also known as BIT-gitlab-2026-5816, GHSA-gj6x-vqpx-4p3c.