CVE-2026-87705

Improper verification of source of a communication channel in Windows Hyper-V allows an…

Risk score: 50/100
CVSS: 7.4 v3.1
Exploit chance (30 days): 0.3%
Published: 13 Oct 2026

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What to know

What it is: Improper verification of source of a communication channel in Windows Hyper-V allows an unauthorized attacker to bypass a security feature over an adjacent network.
Affected: See advisory
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: No known exploitation

Why it is Yellow

CVSS 7.4 high

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87705

Original description

Improper verification of source of a communication channel in Windows Hyper-V allows an unauthorized attacker to bypass a security feature over an adjacent network.

Last activity 13 Oct 2026. Patch Forecast updates every hour.