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GHSA-293q-567p-wmwq

Spring Security Vulnerable to Unauthorized User Impersonation when Using X.509 Client Certificates

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-47838

Packages

EcosystemPackageAffectedFixed in
Maven org.springframework.security:spring-security-web >= 6.5.0, < 6.5.11 6.5.11
Maven org.springframework.security:spring-security-web >= 6.4.0, <= 6.4.13 no fix listed
Maven org.springframework.security:spring-security-web >= 6.0.0, <= 6.3.10 no fix listed
Maven org.springframework.security:spring-security-web >= 5.8.0, <= 5.8.16 no fix listed
Maven org.springframework.security:spring-security-web <= 5.7.14 no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

In Spring Security Web, `SubjectDnX509PrincipalExtractor` 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. `SubjectDnX509PrincipalExtractor` is deprecated by this CVE and replaced with `SubjectX500PrincipalExtractor`. As part of updating, you should also migrate to `SubjectX500PrincipalExtractor`. Affected versions: Spring Security Enterprise 5.7.0 through 5.7.24; 5.8.0 through 5.8.26; 6.3.0 through 6.3.17; 6.4.0 through 6.4.17; 6.5.0 through 6.5.10. OSS 6.5.0 through 6.5.10.

References

External links from the advisory. They lead to third-party sites.