🛡️ CVE-2026-47838 — spring-security

🟡 CVSS 6.8 — Medium ✅ No Known Exploit CWE-287 NVD
6.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2026-47838 is classified as CWE-287: Improper Authentication. The identity of the caller is not established correctly, so an attacker can act as another user.

Affected software

CVE-2026-47838 is recorded against 3 packages.

  • org.springframework.security:spring-security-web
  • spring-security (from 6.5.0 up to 6.5.11)
  • unknown

Timeline and source

Published on 10 June 2026 and last revised on 2 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

nvd.nist.gov (Advisory)
github.com (Advisory)
spring.io (Web)
spring-projects (Package)

Details

Severity Medium
CVSS Score 6.8
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE CWE-287
Public Exploit ✅ No
Source NVD
Published 2026-06-10
Updated 2026-08-12
Modified 2026-07-02
Fix URL N/A

Affected Packages

Software From version Fixed in
org.springframework.security:spring-security-web — —
spring-security 6.5.0 6.5.11
unknown — —

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