PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-47838 VMware CVE debrief

CVE-2026-47838 is a medium-severity vulnerability (CVSS Score: 6.8) affecting Spring Security versions 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, and 6.5.0 through 6.5.10. The vulnerability is caused by the SubjectDnX509PrincipalExtractor not correctly handling 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.

Vendor
VMware
Product
Spring Security
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-30
Advisory published
2026-06-10
Advisory updated
2026-06-30

Who should care

Users of affected Spring Security versions should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The SubjectDnX509PrincipalExtractor does not correctly handle certain malformed X.509 certificate CN values, which can lead to reading the wrong value for the username.

Defensive priority

medium

Recommended defensive actions

  • Upgrade to a non-vulnerable version of Spring Security.
  • Implement additional authentication and authorization measures to prevent impersonation attacks.

Evidence notes

The CVE record and NVD detail pages provide additional information about this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47838 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47838

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47838 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47838

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.