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Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 11.2 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user with project owner permissions to bypass group fork prevention settings due to improper authorization checks.

PUBLISHED Reserved 2025-09-03 | Published 2026-04-22 | Updated 2026-04-22 | Assigner GitLab




LOW: 2.7CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

Default status
unaffected

11.2 (semver) before 18.9.6
affected

18.10 (semver) before 18.10.4
affected

18.11 (semver) before 18.11.1
affected

Credits

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

References

hackerone.com/reports/3275222 (HackerOne Bug Bounty Report #3275222) technical-description exploit permissions-required

gitlab.com/gitlab-org/gitlab/-/work_items/567781

about.gitlab.com/...2/patch-release-gitlab-18-11-1-released/

cve.org (CVE-2025-9957)

nvd.nist.gov (CVE-2025-9957)

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