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CVE-2026-16255Incorrect Authorization in 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 HIGHEPSS 0.26%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 7.1 | HIGH | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N |
| 5.9 | MEDIUM | 3.1GitLab (CNA) | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N |
Details
- CVE ID
- CVE-2026-16255
- Status
- Analyzed
- Assigner (CNA)
- GitLab
- Published
- Oct 22, 2026
- Last modified
- 2026-11-04 23:10 UTC
- Weaknesses
- CWE-863 · Incorrect Authorization
Affected Products
As published by the CNA in the CVE record.
GitLabGitLab3 version ranges
- 12.0 before 19.3.6
- 19.4 before 19.4.3
- 19.5 before 19.5.1