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Microsoft Security Response CenterCVE-2026-50480

Windows Web Proxy Auto-Discovery Protocol (WPAD) Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Web Proxy Auto-Discovery Protocol (WPAD) allows an authorized attacker to elevate privileges locally.

Read the vendor bulletin Get alerts for Windows
7.8CVSS out of 10High severity
Scope

What the vendor says is affected

  • Windows 10 Version 1607 for 32-bit Systems
  • Windows 10 Version 1607 for x64-based Systems
  • Windows Server 2016
  • Windows Server 2016 (Server Core installation)
  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 R2 (Server Core installation)

Versions the vendor lists as fixed

  • 10.0.14393.9339
  • 6.2.9200.26226
  • 1.000
  • 6.3.9600.23291
Next step

What the vendor recommends

Install KB5099535. Install KB5099445. Install KB5099415. Install KB5099444.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-50480View CVSS, KEV, EPSS, and threat context
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