# CVE-2026-87705: Windows Hyper-V improper communication channel verification

Source: https://junglewise.ai/threats/cve-2026-87705-improper-verification-of-source-of-a-communication-channel-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-87705 · Severity: high · CVSS 7.4 · Published 2026-10-13

Windows Hyper-V, Microsoft's virtualization platform used to manage virtual machines in enterprise environments, contains a flaw in how it verifies the source of network communications. An attacker on the same local network can bypass security features by spoofing or intercepting communication channels, potentially gaining unauthorized access to virtual machines or the host system.

Technologies: [Microsoft Windows Hyper-V](https://junglewise.ai/threats/technologies/windows-hyper-v). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-87705 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-87705 being exploited in the wild.

**How severe is CVE-2026-87705?** High severity, with a CVSS score of 7.4, published 13 October 2026.

**Which products and versions are affected?** Microsoft Windows Hyper-V.

**Is there a fix for CVE-2026-87705?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-87705 attacked?** It is attacked from the adjacent network, in an operating system.

**Am I affected by CVE-2026-87705?** Check whether you run Microsoft Windows Hyper-V. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability arises from improper verification of the source of a communication channel in Windows Hyper-V, allowing an attacker on an adjacent network to bypass security features. The attack vector is adjacent network access; no authentication or special preconditions are stated. A successful exploit compromises the integrity of Hyper-V's security isolation between virtual machines and the host.

## Affected products

- Microsoft Windows Hyper-V

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87705](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87705)

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- [Windows Hyper-V access control spoofing vulnerability](https://junglewise.ai/threats/cve-2026-119959-improper-access-control-in-windows-hyper-v-allows-an-authorized)
- [Windows Hyper-V use-after-free privilege elevation](https://junglewise.ai/threats/cve-2026-119826-use-after-free-in-windows-hyper-v-allows-an-authorized-attacker)