---
id: CVE-2026-12910
title: >-
  GitLab has remediated an issue in GitLab CE/EE affecting all versions from
  18.6 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under
  certain conditions could have allowed an authenticated user to bypass SAML SSO
  sign-in r…
summary: >-
  GitLab has remediated an issue in GitLab CE/EE affecting all versions from
  18.6 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under
  certain conditions could have allowed an authenticated user to bypass SAML SSO
  sign-in r…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-306
vendor: GitLab
product: GitLab
affected:
  - GitLab >= 18.6 < 19.1.8
  - GitLab >= 19.2 < 19.2.6
  - GitLab >= 19.3 < 19.3.2
published: '2026-09-15'
updated: '2026-09-20'
sourceUpdated: '2026-09-20T01:16:27.830'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-12910'
references:
  - url: 'https://gitlab.com/gitlab-org/gitlab/-/work_items/603742'
    label: cve@gitlab.com
  - url: 'https://hackerone.com/reports/3745561'
    label: cve@gitlab.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-20T00:35:51.187199Z'
epss: 0.0032
epssPercentile: 0.25161
ingestedAt: '2026-09-15T18:41:59.138Z'
---

## Overview

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.6 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could have allowed an authenticated user to bypass SAML SSO sign-in restrictions and authenticate without SSO due to missing authentication enforcement checks.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.