CVE-2026-5262

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

State: Published
Severity: 8.0 High
Published: Apr 22, 2026
Updated: Apr 22, 2026
Reserved: Mar 31, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.0 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N	GitLab

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
GitLabGitLab	16.1.0 to before 18.9.6Affected 18.10 to before 18.10.4Affected 18.11 to before 18.11.1Affected

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/595332
HackerOne Bug Bounty Report #3574642technical-descriptionexploitpermissions-required
https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/

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