What’s Vulnerable › Vulnerabilities

CVE-2026-12910: Missing Authentication for Critical Function in GitLab

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-28
• Weakness: CWE-306

Description

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.

Affected products

• GitLab: from 18.6.0 before 19.1.8; from 19.2.0 before 19.2.6; from 19.3.0 before 19.3.2 — fixed in 19.1.8, 19.2.6, 19.3.2

How to fix

Upgrade to a fixed version: GitLab 19.1.8, 19.2.6, 19.3.2. Check the vendor advisory for mitigations.

References

• https://gitlab.com/gitlab-org/gitlab/-/work_items/603742
• https://hackerone.com/reports/3745561

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