CVE-2026-22747 PUBLISHED

Unauthorized User Impersonation when Using X.509 Client Certificates

Assigner: vmware
Reserved: 09.01.2026 Published: 22.04.2026 Updated: 22.04.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 6.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Spring
Product	Spring Security
Versions	Default: unaffected affected from 7.0.0 to 7.0.4 (incl.)

References

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