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MSRC compact vulnerability detail

CVE-2026-20819 · Windows Virtualization-Based Security (VBS) Information Disclosure Vulnerability

Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.

Severity
Important
Impact
Information Disclosure
CVSS
5.5 base · 4.8 temporal
Release
2026-01-13
Signals
Windows Virtualization-Based Security (VBS) Enclave Information Disclosure Exploited: No Publicly disclosed: No Exploitability: Exploitation Less Likely
CWE
CWE-822: Untrusted Pointer Dereference
Patch Diff
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Description
Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.
FAQ / Articles
FAQ
What type of information could be disclosed by this vulnerability? An attacker who successfully exploited this vulnerability could view Virtual Trust Level 1 (VTL1) data from Virtual Trust 0 (VTL0) which is the least privileged level.
Windows Virtualization-Based Security (VBS) Enclave Information Disclosure Vulnerability
Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.