CVE-2026-47838

SubjectDnX509PrincipalExtractor 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. Affected versions: Spring Security 5.7....

CVE-2026-47838

Spring Security CVE-2026-47838 involves the SubjectDnX509PrincipalExtractor and malformed X.509 CN values, causing the extracted username to be read incorrectly and potentially allowing an attacker to impersonate another user. Affected versions include Spring Security 5.7.0–5.7.24; 5.8.0–5.8.26; ...

CVE-2026-47838 Unauthorized User Impersonation when Using X.509 Client Certificates

SubjectDnX509PrincipalExtractor 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. Affected versions: Spring Security 5.7....

CVE-2026-47838 Unauthorized User Impersonation when Using X.509 Client Certificates

SubjectDnX509PrincipalExtractor 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. Affected versions: Spring Security 5.7....