Description
GitLab has remediated an issue in GitLab EE affecting all versions from 17.8 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 leak sensitive information from confidential issues by injecting hidden prompts into merge request comments.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 17.8 – < 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 #552611 issue-tracking permissions-required
- HackerOne Bug Bounty Report #3173458 technical-description exploit permissions-required