User Impersonation Affecting org.springframework.security:spring-security-web package, versions [, 6.5.11)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Jun 2026
- disclosed9 Jun 2026
- creditNikita Markevich
Introduced: 9 Jun 2026
CVE-2026-47838 (opens in a new tab)How to fix?
Upgrade org.springframework.security:spring-security-web to version 6.5.11 or higher.
Overview
org.springframework.security:spring-security-web is a package within Spring Security that provides security services for the Spring IO Platform.
Affected versions of this package are vulnerable to User Impersonation via username extraction in SubjectDnX509PrincipalExtractor. An attacker can impersonate another user by presenting a specially crafted X.509 certificate containing a malformed Common Name (CN) value that causes the extractor to resolve an incorrect username during certificate-based authentication.
Note:
This vulnerability is a continuation of CVE-2026-22747, which addressed the same issue in Spring Security 7.0.x.
Exploitation requires compromise or misuse of a trusted upstream certificate validation process, as this component operates within Spring Security's pre-authentication flow and assumes presented certificates have already been validated.