SAML SSO Authentication Bypass in GitLab CE/EE Products
CVE-2026-12910

5.4MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
15 September 2026

What is CVE-2026-12910?

A vulnerability has been identified in GitLab CE/EE that could allow authenticated users to bypass SAML Single Sign-On (SSO) restrictions. This occurs due to inadequate authentication enforcement checks in certain conditions, enabling users to authenticate without following the intended SSO process. This issue affects various versions of GitLab, and prompt remediation is crucial to maintaining system integrity and security.

Affected Version(s)

GitLab 18.6 < 19.1.8

GitLab 19.2 < 19.2.6

GitLab 19.3 < 19.3.2

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/603742
https://hackerone.com/reports/3745561
technical-descriptionexploitpermissions-required

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks [theluci](https://hackerone.com/theluci) for reporting this vulnerability through our HackerOne bug bounty program
.