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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 authenticated user with developer-role permissions to hide changes from merge request diff views due to improper input handling of file names.

PUBLISHED Reserved 2026-04-24 | Published 2026-06-11 | Updated 2026-06-11 | Assigner GitLab




LOW: 3.7CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

Problem types

CWE-639: Authorization Bypass Through User-Controlled Key

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

References

gitlab.com/gitlab-org/gitlab/-/work_items/598165

hackerone.com/reports/3638136 (HackerOne Bug Bounty Report #3638136) technical-description exploit permissions-required

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

cve.org (CVE-2026-6976)

nvd.nist.gov (CVE-2026-6976)

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