CVE-2026-107782: Winsiderss System Informer

High severity, CVSS 7.8. EPSS: 0.1% chance of exploitation in the next 30 days.

System Informer before 4.0.26241.138 contains an incorrect authorization vulnerability in the phsvc helper that allows local attackers to reach privileged APIs by connecting from any Authenticode-signed process. Attackers can load code into a Microsoft-signed host like rundll32.exe, connect to SiSvcApiPort, and call PhSvcApiCreateService to execute code as SYSTEM.

Affected products

• Winsiderss System Informer: before 4.0.26241.138 (fixed in 4.0.26241.138)

Published 2026-10-08. Last modified 2026-10-08.