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

CVE ID :CVE-2026-47838

Published : June 10, 2026, 12:16 a.m. | 20 minutes ago

Description :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 5.7.0 through 5.7.24; 5.8.0 through 5.8.26; 6.3.0 through 6.3.17; 6.4.0 through 6.4.17; 6.5.0 through 6.5.10.

Severity: 6.8 | MEDIUM

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