CVE-2026-5262 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

High 8.0 Published 22 Apr 2026 Updated 22 Apr 2026

An unauthenticated attacker can access tokens in the Storybook development environment via XSS, requiring specific conditions.

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-2026-5262?

CVE-2026-5262 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 16.1.0 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an unauthenticated user to access tokens in the Storybook development environment due to improper input validation.

Weakness: CWE-79

Which versions are affected by CVE-2026-5262?

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

Package	Affected	Fixed in
`gitlab` Bitnami	From `16.1.0`	`18.9.6, 18.10.4, 18.11.1`

Products include Gitlab Gitlab.

How do I fix CVE-2026-5262?

Upgrade gitlab to a fixed version for your release line: 18.9.6, 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-2026-5262 being exploited?

There is no known exploitation of CVE-2026-5262 in the wild and no public exploit code.

All Gitlab Gitlab vulnerabilities

Sources

Also known as BIT-gitlab-2026-5262, GHSA-g9pv-f88j-p6rr.