CVE-2026-36608

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 allows UPnP AddPortMapping to forward external ports to the router's own admin interface by accepting its own IP (192.168.1.1) or localhost (127.0.0.1) as InternalClient. An unauthenticated LAN attacker can expose the admin panel to the internet with a single SOAP request.

Published 2026-06-03. Last modified 2026-07-22.