CVE-2026-12910

Missing Authentication for Critical Function in GitLab

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

GitLab

CVSS v3.1 GITLAB

5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS

0.19% chance of exploitation in the next 30 days, 8th percentile

Published

2026-09-15

Updated

2026-09-20

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3745561

References

• CVE Record
• NVD entry