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Description

An issue has been discovered in GitLab affecting all versions prior to 16.2.7, all versions starting from 16.3 before 16.3.5, and all versions starting from 16.4 before 16.4.1. It was possible for a removed project member to write to protected branches using deploy keys.

PUBLISHED Reserved 2023-09-26 | Published 2023-09-29 | Updated 2025-11-20 | Assigner GitLab




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Problem types

CWE-863: Incorrect Authorization

Product status

Default status
unaffected

Any version
affected

16.3 (semver) before 16.3.5
affected

16.4 (semver) before 16.4.1
affected

Credits

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

References

gitlab.com/gitlab-org/gitlab/-/issues/416957 (GitLab Issue #416957) issue-tracking

hackerone.com/reports/2041789 (HackerOne Bug Bounty Report #2041789) technical-description exploit

gitlab.com/gitlab-org/gitlab/-/issues/416957 (GitLab Issue #416957) issue-tracking

hackerone.com/reports/2041789 (HackerOne Bug Bounty Report #2041789) technical-description exploit permissions-required

cve.org (CVE-2023-5198)

nvd.nist.gov (CVE-2023-5198)