Is CVE-2026-85811 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-85811 being exploited in the wild.

How severe is CVE-2026-85811?

High severity, with a CVSS score of 7.5, published 13 October 2026.

Is there a fix for CVE-2026-85811?

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-2026-85811 attacked?

It is attacked from the adjacent network, in a hosted service.

Am I affected by CVE-2026-85811?

Check whether you run Microsoft Network Policy Server. 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.

CVE-2026-85811: Microsoft Network Policy Server use-after-free remote code execution

CVE-2026-85811 · Severity: high · CVSS 7.5 · Published 2026-10-13

Network Policy Server (NPS) is a Windows component that authenticates and authorizes network access requests. An attacker on an adjacent network can exploit a use-after-free memory vulnerability to execute arbitrary code on affected systems without authentication. This could allow compromise of authentication infrastructure and access to protected network resources.

Technologies: Microsoft Network Policy Server. Vendors: Microsoft.

Quick answers

Is CVE-2026-85811 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-85811 being exploited in the wild.
How severe is CVE-2026-85811?: High severity, with a CVSS score of 7.5, published 13 October 2026.
Which products and versions are affected?: Microsoft Network Policy Server.
Is there a fix for CVE-2026-85811?: 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-2026-85811 attacked?: It is attacked from the adjacent network, in a hosted service.
Am I affected by CVE-2026-85811?: Check whether you run Microsoft Network Policy Server. 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

A use-after-free vulnerability exists in Microsoft Network Policy Server that can be triggered by a specially crafted packet from an adjacent network. The vulnerability allows an unauthenticated attacker to execute arbitrary code with the privileges of the NPS service through a memory safety violation.

Affected products

Microsoft Network Policy Server

Timeline

2026-10-13: disclosed

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85811

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