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Vulnerability · Published Apr 22, 2026 · Assigned by vmware

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

Medium 6.8

In plain English

A medium-severity improper certificate validation in Spring Security from Spring. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.8Medium
Exploit odds (30 days)0.2%top 84.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.springframework.security:spring-security-web7.0.5GHSA-2jrg-rf5x-568g

Affected products (as reported)

VendorProductVersions
Spring Spring Security 7.0.0 – through 7.0.4

Weakness: CWE-297, CWE-295 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

References