CVE-2026-109423
CVE-2026-109423
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.
Vulnerability class: Improper Certificate Validation
Published .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- gist.github.com/LeoWSY-hashblue/10e5383fc2d4d75faf74a9507c6bba9f (technical-description)
- hr.163.com/product.html/music (product)
- www.vulncheck.com/advisories/netease-cloud-music-tls-certificate-validation-byp… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109423?
- CVE-2026-109423 is a high-severity vulnerability, classified under Improper Certificate Validation. CVSS score: 7.4/10. Published 2026-10-12.
- How severe is CVE-2026-109423?
- High severity. CVSS v3 base score is 7.4 out of 10.