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CVE-2026-20819 - Windows 11 version 22H3 Plugin

CVE-2026-20819

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

CVE-2026-20819

MEDIUM CVSS 5.5 Published 2026-01-13 Updated 2026-01-14
AI Risk Moderate (48/100) Active Exploit: No strong signal Published Exploit: No public exploit references Priority: P4 Planned
Severity Band MEDIUM
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected Components 4
Reference Links 1
AI Risk Engine Moderate (48/100)
Exploitability Low
Active Exploitation No strong signal
Published Exploit Status No public exploit references

Threat Timeline

  1. 2026-01-13 CVE published and first recorded in the threat feed.
  2. 2026-01-14 Record updated with latest vulnerability metadata.
  3. 2026-04-09 AI technical context refreshed for mitigation and impact guidance.
  4. Now Monitoring for follow-up changes, linked references, and new related CVEs.

AI Context

Machine-generated threat intelligence

AI Updated 12 days ago

AI enriched 12 days ago (2026-04-09 08:14 UTC)

Technical Summary

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

Potential Impact

Severity is MEDIUM (CVSS 5.5). Depending on deployment context, affected components may be exposed to unauthorized actions or data integrity risk.

Exploitability Assessment

Exploitability is assessed as Low based on severity and technical exposure profile.

Primary risk drivers: severity and technical exposure profile

Mitigation Recommendations

Validate affected product versions, prioritize patching, and monitor references for vendor remediation guidance. If immediate patching is not possible, apply compensating controls and limit exposure of vulnerable surfaces.

Detection & Monitoring

Track authentication anomalies, unexpected file writes, and suspicious plugin API activity around affected components.

Business Impact Lens

Prioritize remediation where affected components process customer data, admin sessions, or Internet-exposed workflows.

Affected Products

Windows 11 version 22H3 PLUGIN · windows-11-version-22h3 Affected: >= 10.0.22631.0, < 10.0.22631.6491 Fixed in: 10.0.22631.6491
Windows 11 Version 23H2 PLUGIN · windows-11-version-23h2 Affected: >= 10.0.22631.0, < 10.0.22631.6491 Fixed in: 10.0.22631.6491
Windows 11 Version 24H2 PLUGIN · windows-11-version-24h2 Affected: >= 10.0.26100.0, < 10.0.26100.7623 Fixed in: 10.0.26100.7623
Windows 11 Version 25H2 PLUGIN · windows-11-version-25h2 Affected: >= 10.0.26200.0, < 10.0.26200.7623 Fixed in: 10.0.26200.7623
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