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CVE-2026-85799 Microsoft CVE debrief

A use-after-free vulnerability in the Network Policy Server (NPS) allows an unauthorized attacker to execute code over a network. Multiple Windows versions and server releases are affected, including Windows 10, Windows 11, and Windows Server 2012 through 2025. Microsoft has released patches for these vulnerabilities. The vulnerability is a high-severity issue that requires immediate attention from system administrators and security teams. Affected products include Windows 10 versions 1607, 1809, 21H2, 22H2; Windows 11 versions 23H2, 24H2, 25H2, 26H1, 26H2; and Windows Server versions 2012, 2012 R2, 2016, 2019, 2022, 2025. The CVE Program and NVD provide official records of the

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

System administrators and security teams responsible for Windows and Windows Server systems should assess exposure and apply patches. Network administrators should review NPS configurations.

Why it matters

CVE-2026-85799 is a high-severity vulnerability in Network Policy Server (NPS) that allows remote code execution. Defenders should apply patches, review NPS configurations, and monitor network traffic.

  • Potential remote code execution over the network.
  • Necessity to apply patches for multiple Windows and server versions.
  • Review and update of network policy server configurations.
  • Verification of system integrity and vulnerability scans.

Technical summary

The vulnerability is a use-after-free issue in the Network Policy Server (NPS). An unauthorized attacker can exploit this vulnerability to execute code over a network. Affected products include Windows 10 versions 1607, 1809, 21H2, 22H2; Windows 11 versions 23H2, 24H2, 25H2, 26H1, 26H2; and Windows Server versions 2012, 2012 R2, 2016, 2019, 2022, 2025.

Defensive priority

Apply patches immediately for affected Windows versions and servers. Review network configurations and ensure proper isolation of NPS systems.

Recommended defensive actions

  • Apply patches for affected Windows 10, Windows 11, and Windows Server versions.
  • Review and update network policy server configurations.
  • Monitor network traffic for suspicious activity.
  • Verify system integrity and perform vulnerability scans.

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft's MSRC offers patches and additional guidance. The vulnerability has been publicly disclosed and requires immediate attention from system administrators and security teams. The official CVE record and NVD detail page provide source-specific vulnerability assessments and guidance on affected scope, severity, and vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-85799 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-85799

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-85799 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-85799

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.