Input validation error in Spring Security - CVE-2026-22747
Published: April 27, 2026
Vulnerability identifier: #VU128228
CSH Severity: Low
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-2026-22747
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to impersonate another user.
The vulnerability exists due to improper input validation in SubjectX500PrincipalExtractor when processing malformed X.509 certificate CN values. A remote user can present a carefully crafted certificate to impersonate another user.
Exploitation presupposes compromise of a trusted upstream that validates the presented credentials in the pre-authentication flow.
Affected software
Spring Security
How to mitigate CVE-2026-22747
Install security update from vendor's website.
Spring Security - update to 7.0.5