CVE-2026-47838: VMware Spring Security

High severity, CVSS 8.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• VMware Spring Security: before 5.7.25 (fixed in 5.7.25); from 5.8.0, before 5.8.27 (fixed in 5.8.27); from 6.3.0, before 6.3.18 (fixed in 6.3.18); from 6.4.0, before 6.4.18 (fixed in 6.4.18); from 6.5.0, before 6.5.11 (fixed in 6.5.11)

Published 2026-06-10. Last modified 2026-07-23.