What is CVE-2026-5262?

CVE-2026-5262 is a high-severity vulnerability in Gitlab, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2026-04-22.

How severe is CVE-2026-5262?

High severity. CVSS v3 base score is 8.0 out of 10.

XSS in Gitlab

CVE-2026-5262

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 th…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (22.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.

Affected products

Gitlab — versions 16.1.0, 18.10, 18.11

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

gitlab.com/gitlab-org/gitlab/-/work_items/595332
HackerOne Bug Bounty Report #3574642 (technical-description, exploit, permissions-required)
about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/

Frequently asked questions

What is CVE-2026-5262?: CVE-2026-5262 is a high-severity vulnerability in Gitlab, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2026-04-22.
How severe is CVE-2026-5262?: High severity. CVSS v3 base score is 8.0 out of 10.