GitLab <=18.11.1 Storybook token disclosure to unauthenticated user
CVE-2026-5262 Published on April 22, 2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
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.
Vulnerability Analysis
CVE-2026-5262 is exploitable with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-5262 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-5262
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Affected Versions
GitLab:- Version 16.1.0 and below 18.9.6 is affected.
- Version 18.10 and below 18.10.4 is affected.
- Version 18.11 and below 18.11.1 is affected.