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CVE-2022-26783: Windows Hyper-V Shared Virtual Hard Disks Information Disclosure Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-04-15 · updated 2026-06-17

Description

Windows Hyper-V Shared Virtual Hard Disks Information Disclosure Vulnerability

Affected products

• Microsoft Windows Server 2016: 20h2
• Microsoft Windows Server 2019: all versions
• Microsoft Windows Server 2022: all versions
• Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.5066 — fixed in 10.0.14393.5066
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2803 — fixed in 10.0.17763.2803
• Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.643 — fixed in 10.0.20348.643
• Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1645 — fixed in 10.0.19042.1645

How to fix

Upgrade to a fixed version: Microsoft Windows Server 2016 10.0.14393.5066; Microsoft Windows Server 2019 10.0.17763.2803; Microsoft Windows Server 2022 10.0.20348.643; Microsoft Windows Server version 20H2 10.0.19042.1645. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26783
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-26783

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