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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.

PUBLISHED Reserved 2026-05-27 | Published 2026-06-11 | Updated 2026-06-11 | Assigner GitLab




LOW: 2.6CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N

Problem types

CWE-153: Improper Neutralization of Substitution Characters

Product status

Default status
unaffected

15.9 (semver) before 18.10.8
affected

18.11 (semver) before 18.11.5
affected

19.0 (semver) before 19.0.2
affected

Credits

Thanks [3nvz](https://hackerone.com/3nvz) for reporting this vulnerability through our HackerOne bug bounty program finder

References

gitlab.com/gitlab-org/gitlab/-/work_items/601330

hackerone.com/reports/3685720 (HackerOne Bug Bounty Report #3685720) technical-description exploit permissions-required

about.gitlab.com/...10/patch-release-gitlab-19-0-2-released/

cve.org (CVE-2026-9694)

nvd.nist.gov (CVE-2026-9694)

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