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Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9.6 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 invoke unintended server-side methods through websocket connections due to improper access control.

PUBLISHED Reserved 2026-03-30 | Published 2026-04-08 | Updated 2026-04-09 | Assigner GitLab




HIGH: 8.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Problem types

CWE-749: Exposed Dangerous Method or Function

Product status

Default status
unaffected

16.9.6 (semver) before 18.8.9
affected

18.9 (semver) before 18.9.5
affected

18.10 (semver) before 18.10.3
affected

Credits

This vulnerability has been discovered internally by GitLab team member Simon Tomlinson finder

References

gitlab.com/gitlab-org/gitlab/-/work_items/588959

about.gitlab.com/...8/patch-release-gitlab-18-10-3-released/

cve.org (CVE-2026-5173)

nvd.nist.gov (CVE-2026-5173)

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