CVE-2026-22747

Unauthorized User Impersonation when Using X.509 Client Certificates

CVSS 6.8 MEDIUMEPSS 0.2%CWE-297

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.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Spring · Spring Security

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References

https://spring.io/security/cve-2026-22747