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Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 1.0 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user to cause repository downloads to contain different code than displayed in the web interface due to incorrect validation of branch references under certain circumstances.

PUBLISHED Reserved 2026-01-20 | Published 2026-03-11 | Updated 2026-03-11 | Assigner GitLab




MEDIUM: 4.1CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

Problem types

CWE-706: Use of Incorrectly-Resolved Name or Reference

Product status

Default status
unaffected

1.0 (semver) before 18.7.6
affected

18.8 (semver) before 18.8.6
affected

18.9 (semver) before 18.9.2
affected

Credits

Thanks [st4nly0n](https://hackerone.com/st4nly0n) for reporting this vulnerability through our HackerOne bug bounty program finder

References

hackerone.com/reports/3505165 (HackerOne Bug Bounty Report #3505165) technical-description exploit permissions-required

gitlab.com/gitlab-org/gitlab/-/work_items/587002

about.gitlab.com/...11/patch-release-gitlab-18-9-2-released/

cve.org (CVE-2026-1230)

nvd.nist.gov (CVE-2026-1230)

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