cve 2026 50509

The cve 2026 50509 tag covers a Windows elevation-of-privilege vulnerability affecting the Wireless Wide Area Network Service, or WwanSvc. Microsoft addressed the issue in the July 14, 2026 security updates. The vulnerability results from deserialization of untrusted data and could allow an authenticated local attacker to gain substantially greater control of a vulnerable Windows machine. Microsoft rates CVE-2026-50509 as Important, while its CVSS 3.1 base score of 7.8 places it in the High severity range. This tag page provides the related security update coverage and highlights why administrators should deploy the applicable July cumulative update rather than leave affected systems unpatched.