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

Quick assessment

Affected
Spring Spring Security
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Spring Security是Spring开源的一款具有认证和授权功能的安全框架。 Spring Security 7.0.4及之前版本存在安全漏洞，该漏洞源于SubjectX500PrincipalExtractor未正确处理某些畸形X.509证书CN值，可能导致读取错误的用户名，在精心构造的证书中可能导致攻击者冒充其他用户。

CVSS 6.8 · Medium EPSS 0.30% · P20

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 1

VendorProduct Version RangeStatus
Spring Spring Security 7.0.0≤ 7.0.4 affected
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I. Basic Information for CVE-2026-22747

Vulnerability Information
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Vulnerability Title
Unauthorized User Impersonation when Using X.509 Client Certificates
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Spring Security 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Spring Security是Spring开源的一款具有认证和授权功能的安全框架。 Spring Security 7.0.4及之前版本存在安全漏洞，该漏洞源于SubjectX500PrincipalExtractor未正确处理某些畸形X.509证书CN值，可能导致读取错误的用户名，在精心构造的证书中可能导致攻击者冒充其他用户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Spring Spring Security 7.0.0 ~ 7.0.4 -

II. Public POCs for CVE-2026-22747

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III. Intelligence Information for CVE-2026-22747

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Same Patch Batch · Spring · 2026-04-22 · 5 CVEs total

CVE-2026-22754 7.5 HIGH ervlet Path Not Correctly Included in Path Matching of XML Authorization Rules
CVE-2026-22753 7.5 HIGH Servlet Path Not Correctly Included in Path Matching of HttpSecurity#securityMatchers
CVE-2026-22748 5.3 MEDIUM Potential Security Misconfiguration when Using withIssuerLocation
CVE-2026-22746 3.7 LOW User Attribute Enumeration when Using DaoAuthenticationProvider

IV. Related Vulnerabilities

Same product: Spring Security
Same vendor: Spring

V. Comments for CVE-2026-22747

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