---
id: CVE-2026-86530
title: >-
  BUFFALO Wi-Fi products handle some web form input improperly to assemble
  command line strings internally
summary: >-
  BUFFALO Wi-Fi products handle some web form input improperly to assemble
  command line strings internally. An administrative user may send a crafted
  HTTP request and execute an arbitrary OS command.
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
vendor: BUFFALO INC.
product: WSR-300HP
affected:
  - WSR-300HP < Ver.2.55
  - WEX-G300 < Ver.1.71
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T09:17:07.653'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86530'
references:
  - url: 'https://jvn.jp/en/vu/JVNVU94863997/'
    label: vultures@jpcert.or.jp
  - url: 'https://www.buffalo.jp/news/detail/20260928-01.html'
    label: vultures@jpcert.or.jp
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-28T09:06:28.563Z'
---

## Overview

BUFFALO Wi-Fi products handle some web form input improperly to assemble command line strings internally. An administrative user may send a crafted HTTP request and execute an arbitrary OS command.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.