CVE-2026-22747

MEDIUM6.8EPSS 0.03%

Spring Security Vulnerable to Unauthorized User Impersonation when Using X.509 Client Certificates

Published: 4/22/2026Modified: 5/5/2026

Also known as:GHSA-2jrg-rf5x-568gCGA-53fx-c46p-vwc9

Description

Vulnerability in Spring Spring Security. SubjectX500PrincipalExtractor does not correctly handle certain malformed X.509 certificate CN values, which can lead to reading the wrong value for the username. In a carefully crafted certificate, this can lead to an attacker impersonating another user. This issue affects Spring Security: from 7.0.0 through 7.0.4.

Affected packages (1)

Maven/org.springframework.security:spring-security-web>= 7.0.0, < 7.0.5

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM6.8	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

References (4)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-22747
PATCHhttps://github.com/spring-projects/spring-security
WEBhttps://github.com/spring-projects/spring-security/commit/88118afb8f9357ae7cc215500a441e89fee701c3
WEBhttps://spring.io/security/cve-2026-22747