Improper Authentication in GitLab Enterprise Edition and Gitlab Community Edition - CVE-2026-15723
Published: October 22, 2026
Vulnerability identifier: #VU157239
CSH Severity: Medium
CVSS v4: 7.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-15723
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to take over an existing LDAP-backed account.
The vulnerability exists due to improper authentication caused by insufficient input sanitization in the LDAP email lookup path when linking OmniAuth identities. A remote user can manipulate input used during identity linking to take over an existing LDAP-backed account.
Exploitation requires both OmniAuth SAML and LDAP auto-linking to be enabled.
Affected software
GitLab Enterprise Edition
Gitlab Community Edition
Gitlab Community Edition
How to mitigate CVE-2026-15723
Install security update from vendor's website.
GitLab Enterprise Edition - addressed in versions 19.3.6, 19.4.3, 19.5.1
Gitlab Community Edition - addressed in versions 19.3.6, 19.4.3, 19.5.1
Gitlab Community Edition - addressed in versions 19.3.6, 19.4.3, 19.5.1