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CVE-2026-16255 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CNA: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/	[email protected]	Release NotesVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/work_items/606479	[email protected]	Permissions Required
https://hackerone.com/reports/3809350	[email protected]	Permissions Required

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-863	Incorrect Authorization	[email protected]

Affected Products

Product	Versions
gitlab gitlab	>= 12.0.0, < 19.3.6 >= 19.4.0, < 19.4.3 19.5.0
CPE cpe:2.3:a:gitlab:gitlab:::::enterprise:::* cpe:2.3:a:gitlab:gitlab:19.5.0::::enterprise::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Nov 4, 2026	CVE Translated	[email protected]
Oct 30, 2026	CVE Modified	CISA-ADP
Oct 29, 2026	Initial Analysis	[email protected]
Oct 22, 2026	New CVE Received	[email protected]