Auth bypass in Gitlab
CVE-2026-2104
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that could have allowed an authenticated user to access confidential issues assigned to other users…
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.000 (4.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Gitlab — versions 18.2, 18.9, 18.10
Weakness classification (CWE)
References
- HackerOne Bug Bounty Report #3541476 (technical-description, exploit, permissions-required)
- gitlab.com/gitlab-org/gitlab/-/work_items/589021
- about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released/
Frequently asked questions
- What is CVE-2026-2104?
- CVE-2026-2104 is a medium-severity vulnerability in Gitlab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-04-08.
- How severe is CVE-2026-2104?
- Medium severity. CVSS v3 base score is 4.3 out of 10.