Vulnerability · Published Apr 22, 2026 · Assigned by GitLab
CVE-2026-5262Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
High 8.0
In plain English
A high-severity cross-site scripting in GitLab from GitLab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Severity (CVSS 3.1)8.0High
Exploit odds (30 days)0.2%top 87.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
References
- https://gitlab.com/gitlab-org/gitlab/-/work_items/595332
- HackerOne Bug Bounty Report #3574642 technical-description, exploit, permissions-required
- https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/