Vulnerability record · CVE-2026-16255 · published 22 October 2026

CVE-2026-16255: Gitlab incorrect authorization vulnerability

Gitlab · Gitlab

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.

7.1 CVSS 3.1 High EPSS 0.26% · top 82.0% CWE-863 · Incorrect authorization

7.1CVSS 3.1 base score

0.26%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References

4 Nov 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Gitlab Gitlab

References

Link	Tags
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/	Release NotesVendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/work_items/606479	Permissions Required
https://hackerone.com/reports/3809350	Permissions Required

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-16255), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.