Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.1 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to bypass WebAuthn two-factor authentication by manipulating the session state under certain conditions.
Affected products
gitlab: gitlab
References3
- about.gitlab.com/releases/2025/12/10/patch-release-gitlab-18-6-… Release NotesVendor Advisory
- gitlab.com/gitlab-org/gitlab/-/issues/577847 Broken Link
- hackerone.com/reports/3322714 Permissions Required
Metrics
- CVSS 3.1
-
6.8
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N - EPSS — exploit probability
- 0% percentile: 36 · as of 11 November 2026
- CWE
- CWE-288
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.