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Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.10 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 developer-role permissions to modify hidden merge requests due to incorrect authorization enforcements.

PUBLISHED Reserved 2026-04-14 | Published 2026-06-11 | Updated 2026-06-11 | Assigner GitLab




MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

Default status
unaffected

15.10 (semver) before 18.10.8
affected

18.11 (semver) before 18.11.5
affected

19.0 (semver) before 19.0.2
affected

Credits

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

References

gitlab.com/gitlab-org/gitlab/-/work_items/596625

hackerone.com/reports/3661880 (HackerOne Bug Bounty Report #3661880) technical-description exploit permissions-required

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

cve.org (CVE-2026-6269)

nvd.nist.gov (CVE-2026-6269)

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