CVE-2026-5262

HIGH severity · CVSS 8 · Cross-site scripting (XSS)

8CVSS HIGH

Summary

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.

Impact & exploitability

Attack vectorNetwork

Attack complexityHigh

Privileges requiredNone

User interactionRequired

Confidentiality impactHigh

Integrity impactHigh

Availability impactNone

Exploit probability (EPSS)0%

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

Affected products we track (1)

GitLab

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Additional information

NVD record
https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/Advisory
https://gitlab.com/gitlab-org/gitlab/-/work_items/595332
https://hackerone.com/reports/3574642