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Description

GitLab has remediated an issue in GitLab EE affecting all versions from 15.5 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 authenticated user with group Owner role to take over another group member's GitLab account due to improper authorization in the Group SAML identity management functionality.

PUBLISHED Reserved 2026-04-17 | Published 2026-06-11 | Updated 2026-06-12 | Assigner GitLab




HIGH: 8.7CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Problem types

CWE-639: Authorization Bypass Through User-Controlled Key

Product status

Default status
unaffected

15.5 (semver) before 18.10.8
affected

18.11 (semver) before 18.11.5
affected

19.0 (semver) before 19.0.2
affected

Credits

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

References

gitlab.com/gitlab-org/gitlab/-/work_items/597295

hackerone.com/reports/3655189 (HackerOne Bug Bounty Report #3655189) technical-description exploit permissions-required

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

cve.org (CVE-2026-6552)

nvd.nist.gov (CVE-2026-6552)

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