---
id: "CVE-2026-97860"
kind: "vulnerability"
aliases: ["CVE-2026-97860"]
title: "Yamaha YMS-VPN8 routers: unquoted Windows service paths allow SYSTEM code execution"
severity: "high"
cvss: 8.4
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "YMS-VPN8", "fixed": ["1.07.00"], "affected": "<= 1.04.00", "ecosystem": "vendor"}, {"name": "YMS-VPN8-CP", "fixed": ["1.07.00"], "affected": "<= 1.04.00", "ecosystem": "vendor"}]
ecosystems: []
tags: ["infrastructure", "local-privilege-escalation", "windows", "yamaha", "yms-vpn8"]
not_affected_if: ["no-local-write-access", "product-not-installed", "single-trusted-user", "version-1.07.00-or-later"]
published_at: "2026-10-29T12:17:14+00:00"
first_seen_at: "2026-10-29T12:24:39+00:00"
updated_at: "2026-10-29T12:26:49+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97860", "first_seen_at": "2026-10-29T12:24:39+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-29T12:26:49+00:00"}]
---

# Yamaha YMS-VPN8 routers: unquoted Windows service paths allow SYSTEM code execution

Yamaha YMS-VPN8 and YMS-VPN8-CP provide Windows services registered with unquoted file paths. A local user with write access to the system drive may run arbitrary code with SYSTEM privileges.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:YMS-VPN8 affected <= 1.04.00 fixed 1.07.00
- vendor:YMS-VPN8-CP affected <= 1.04.00 fixed 1.07.00

## How to check

- In YMS-VPN8 / YMS-VPN8-CP on Windows, check the installed version: Ver.1.04.00 or earlier is affected, Ver.1.07.00 is fixed
- List the services with `sc qc <service name>` and look for a BINARY_PATH_NAME that is unquoted and contains spaces

## Fix

Update YMS-VPN8 / YMS-VPN8-CP to Ver.1.07.00 (latest from Yamaha's official site).

## Timeline

- 2026-10-29T12:24:39+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-97860
- 2026-10-29T12:26:49+00:00 analyst — Yamaha FAQ + JVN#30675482 + 1.07.00 release note: affected <=1.04.00, fixed 1.07.00. Local only, not exploited; no PoC. Vendor workaround if no update: don't share the PC, no untrusted logins, no needless admin rights, don't run unknown files.

## Documents

- [advisory] Yamaha RT FAQ: YMS-VPN8 unquoted file path (JVN#30675482) https://www.rtpro.yamaha.co.jp/RT/FAQ/Security/JVN30675482.html
- [advisory] JVN#30675482 Yamaha YMS-VPN8 unquoted file paths https://jvn.jp/en/jp/JVN30675482/
- [fix] YMS-VPN8 Ver.1.07.00 release note https://www.rtpro.yamaha.co.jp/RT/utility/YMS-VPN8/ReleaseNote_ver.1.07.00.html

## From the sources

YMS-VPN8 and YMS-VPN8-CP provided by Yamaha Corporation register Windows services with unquoted file paths. A user who has write permissions on the system drive may be able to execute arbitrary code with SYSTEM privileges.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_