Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to bypass access control restrictions and view GitLab Pages content intended only for project members by authenticating through OAuth providers.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 17.9 – < 18.3.6, 18.4 – < 18.4.4, 18.5 – < 18.5.2 | 18.3.6 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | gitlab | No fix yet | — |
Advisories 2
- WID-SEC-2025-2587 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 14, 2026
- NCSC-2025-0367 Kwetsbaarheden verholpen in GitLab NCSC-NL (Netherlands) · Nov 18, 2025
References
- https://about.gitlab.com/releases/2025/11/12/patch-release-gitlab-18-5-2-released/
- GitLab Issue #556098 issue-tracking permissions-required
- HackerOne Bug Bounty Report #3250156 technical-description exploit permissions-required