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CVE-2026-20935 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-13T18:16:20.500Z and has not been modified since then. The CVE-2026-20935 vulnerability involves an untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave, allowing an unauthorized attacker to disclose information locally. This issue has a CVSS score of 6.2, indicating a medium severity level. Affected configurations include various Windows 11 versions and architectures, specifically those with VBS Enclave enabled. Microsoft has provided a vendor advisory for this vulnerability. System administrators and security teams should be aware of this vulnerability and ensure that all affected systems are inventoried and up-to-date with the latest security patches. Implementing compensating controls to monitor and restrict local access to sensitive information can help mitigate the risk associated with this vulnerability.

Vendor
Microsoft
Product
Windows 11 version 23H2
CVSS
MEDIUM 6.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-13
Original CVE updated
2026-07-30
Advisory published
2026-01-13
Advisory updated
2026-07-30

Who should care

System administrators and security teams responsible for Windows systems, particularly those utilizing Virtualization-Based Security (VBS) Enclave, should be aware of this vulnerability. Ensuring that all affected systems are inventoried and up-to-date with the latest security patches is crucial. Additionally, implementing compensating controls to monitor and restrict local access to sensitive information can help mitigate the risk associated with this vulnerability.

Technical summary

The CVE-2026-20935 vulnerability involves an untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave. This issue allows an unauthorized attacker to disclose information locally. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 6.2, indicating a medium severity level. Affected configurations include various Windows 11 versions and architectures, specifically those with VBS Enclave enabled. Microsoft has provided a vendor advisory for this vulnerability.

Defensive priority

Medium-priority defensive actions are recommended due to the local information disclosure risk associated with this vulnerability.

Recommended defensive actions

  • Review and apply the vendor advisory from Microsoft regarding CVE-2026-20935.
  • Inventory Windows systems for VBS Enclave configurations and ensure they are up-to-date.
  • Implement compensating controls to monitor and restrict local access to sensitive information.
  • Consider enabling additional security features in Windows to mitigate the impact of this vulnerability.

Evidence notes

The CVE-2026-20935 record indicates an untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave, allowing local information disclosure. The CVSS score is 6.2 (MEDIUM). Affected configurations include various Windows 11 versions and architectures. Vendor advisory is available from Microsoft.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-13T18:16:20.500Z and has not been modified since then.