What’s Vulnerable › Vulnerabilities

CVE-2026-22747: Unauthorized User Impersonation when Using X.509 Client Certificates

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-22 · updated 2026-10-26
• Weakness: CWE-297

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.

Affected products

• Spring Security: from 7.0.0 before 7.0.5 — fixed in 7.0.5
• Spring Security: from 7.0.0 through 7.0.4

How to fix

Upgrade to a fixed version: Spring Security 7.0.5. Check the vendor advisory for mitigations.

References

• https://spring.io/security/cve-2026-22747
• https://access.redhat.com/security/cve/CVE-2026-22747
• https://bugzilla.redhat.com/show_bug.cgi?id=2460487
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22747.json

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