CVE-2026-16255

Published: Oct 22, 2026Modified: Oct 22, 2026

5.9

Vector

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

Exploitability: 1.6 / Impact: 4.2

Source: cve@gitlab.com (Secondary)

Description

GitLab has remediated an issue in GitLab EE affecting all versions from 12.0 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, when the instance-wide SAML or LDAP membership lock was enabled, an authenticated user could have granted or accepted project and group membership outside the identity provider's control, due to incomplete enforcement of the membership lock on requests created before the lock was enabled.

Related CWEs

CWE-863

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.

References (3)

https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/

Source: cve@gitlab.com

https://gitlab.com/gitlab-org/gitlab/-/work_items/606479

Source: cve@gitlab.com

https://hackerone.com/reports/3809350

Source: cve@gitlab.com

Timeline

No history available yet.