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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.

PUBLISHED Reserved 2026-03-31 | Published 2026-04-22 | Updated 2026-04-22 | Assigner GitLab




HIGH: 8.0CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Problem types

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

Product status

Default status
unaffected

16.1.0 (semver) before 18.9.6
affected

18.10 (semver) before 18.10.4
affected

18.11 (semver) before 18.11.1
affected

Credits

Thanks [joaxcar](https://hackerone.com/joaxcar) for reporting this vulnerability through our HackerOne bug bounty program finder

References

gitlab.com/gitlab-org/gitlab/-/work_items/595332

hackerone.com/reports/3574642 (HackerOne Bug Bounty Report #3574642) technical-description exploit permissions-required

about.gitlab.com/...2/patch-release-gitlab-18-11-1-released/

cve.org (CVE-2026-5262)

nvd.nist.gov (CVE-2026-5262)

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