Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.9 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions, could have allowed an unauthenticated user to impersonate the GitLab Support Bot and inject arbitrary content via a specially crafted Service Desk email reply due to improper neutralization in email template processing.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 15.9 – < 18.10.8, 18.11 – < 18.11.5, 19.0 – < 19.0.2 | 18.10.8 |
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 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | gitlab-runner-18.6 +35 | No fix yet | — |
| Wolfi rolling | gitlab-runner-19.0 +5 | 19.0.2-r0 | — |
Advisories 2
- NCSC-2026-0196 Kwetsbaarheden verholpen in GitLab Enterprise Edition NCSC-NL (Netherlands) · Jun 12, 2026
- WID-SEC-2026-1886 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 11, 2026
References
- https://gitlab.com/gitlab-org/gitlab/-/work_items/601330
- HackerOne Bug Bounty Report #3685720 technical-description exploit permissions-required
- https://about.gitlab.com/releases/2026/06/10/patch-release-gitlab-19-0-2-released/