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CVE-2026-83501: Windows Virtualization-Based Security (VBS) Information Disclosure Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-08 · updated 2026-10-31
• Weakness: CWE-125

Description

Out-of-bounds read in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.

Affected products

• Microsoft Windows 11: before 10.0.22631.7582 — fixed in 10.0.22631.7582
• Microsoft Windows 11: before 10.0.26100.9445 — fixed in 10.0.26100.9445
• Microsoft Windows 11 25H2: before 10.0.26200.9445 — fixed in 10.0.26200.9445
• Microsoft Windows 11 version 26H1: before 10.0.28000.2954 — fixed in 10.0.28000.2954
• Microsoft Windows Server 2025: before 10.0.26100.33438 — fixed in 10.0.26100.33438
• Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.7582 — fixed in 10.0.22631.7582
• Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.9445 — fixed in 10.0.26100.9445
• Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.9445 — fixed in 10.0.26200.9445
• Microsoft Windows 11 version 26H1: from 10.0.28000.0 before 10.0.28000.2954 — fixed in 10.0.28000.2954
• Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.33438 — fixed in 10.0.26100.33438

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.22631.7582; Microsoft Windows 11 10.0.26100.9445; Microsoft Windows 11 25H2 10.0.26200.9445; Microsoft Windows 11 version 26H1 10.0.28000.2954; Microsoft Windows Server 2025 10.0.26100.33438; Microsoft Windows 11 10.0.22631.7582; Microsoft Windows 11 10.0.26100.9445; Microsoft Windows 11 25H2 10.0.26200.9445; Microsoft Windows 11 version 26H1 10.0.28000.2954; Microsoft Windows Server 2025 10.0.26100.33438. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83501

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