GitLabCVE-2026-12910

GitLab: missing authentication

CVE-2026-12910 · Published Sep 15, 2026 · updated Sep 28, 2026

Medium5.4

Fix: upgrade to 19.1.8 or later (3 fixed versions below)

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 versions

Package	Affected	Fixed in
GitLab Product	>= 18.6, < 19.1.8	19.1.8
	>= 19.2, < 19.2.6	19.2.6
	>= 19.3, < 19.3.2	19.3.2

Details and references

CVSS 3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Severity from: the vendor (its own CVE record or advisory)
Weakness: CWE-306

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