---
id: CVE-2026-50480
title: >-
  Heap-based buffer overflow in Windows Web Proxy Auto-Discovery Protocol (WPAD)
  allows an authorized attacker to elevate privileges locally.
summary: >-
  Heap-based buffer overflow in Windows Web Proxy Auto-Discovery Protocol (WPAD)
  allows an authorized attacker to elevate privileges locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: microsoft
product: windows_10_1607
affected:
  - windows_10_1607 < 10.0.14393.9339
  - windows_server_2012
  - windows_server_2012 = r2
  - windows_server_2016 < 10.0.14393.9339
patched:
  - windows_10_1607 10.0.14393.9339
  - windows_server_2016 10.0.14393.9339
published: '2026-07-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-50480'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50480'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-16T00:00:00+00:00'
epss: 0.00333
epssPercentile: 0.26463
ingestedAt: '2026-09-08T17:06:31.916Z'
---

## Overview

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

## Affected

- `windows_10_1607 < 10.0.14393.9339`
- `windows_server_2012`
- `windows_server_2012 = r2`
- `windows_server_2016 < 10.0.14393.9339`

## Remediation

Upgrade past the affected range:

- `windows_10_1607 10.0.14393.9339`
- `windows_server_2016 10.0.14393.9339`