CVE-2026-22747

Unauthorized User Impersonation when Using X.509 Client Certificates

State: Published
Severity: 6.8 Medium
Published: Apr 22, 2026
Updated: Jul 15, 2026
Reserved: Jan 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	6.8 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N	vmware
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	redhat-SADP

Weaknesses

CWE-297 Improper Validation of Certificate with Host Mismatch
CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
Spring SecuritySpring	7.0.0 through 7.0.4Affected

References

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