---
id: CVE-2026-109423
title: >-
  NetEase Cloud Music client for Windows (cloudmusic.exe) versions 3.1.38 and
  3.1.39.205426 contains a TLS certificate validation vulnerability that allows
  a network-adjacent attacker to intercept and decrypt HTTPS traffic by failing
  to va…
summary: >-
  NetEase Cloud Music client for Windows (cloudmusic.exe) versions 3.1.38 and
  3.1.39.205426 contains a TLS certificate validation vulnerability that allows
  a network-adjacent attacker to intercept and decrypt HTTPS traffic by failing
  to va…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-295
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T20:17:08.993'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109423'
references:
  - url: 'https://gist.github.com/LeoWSY-hashblue/10e5383fc2d4d75faf74a9507c6bba9f'
    label: disclosure@vulncheck.com
  - url: 'https://hr.163.com/product.html/music'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/netease-cloud-music-tls-certificate-validation-bypass
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T21:04:28.919Z'
---

## Overview

NetEase Cloud Music client for Windows (cloudmusic.exe) versions 3.1.38 and 3.1.39.205426 contains a TLS certificate validation vulnerability that allows a network-adjacent attacker to intercept and decrypt HTTPS traffic by failing to validate the server certificate chain, verify the hostname, or consult any Windows certificate trust store. Attackers can perform a man-in-the-middle attack using a rogue certificate authority to decrypt traffic, capture the MUSIC_U session credential sent in authenticated API requests, and modify server responses in transit, enabling account takeover and transport-layer response forgery.

## Remediation

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