EnGenius ESR580 A8J-EMR5000 devices allow a remote attacker to conduct stored XSS attacks that could lead to arbitrary JavaScript code execution (under the context of the user's session) via the Wi-Fi SSID input fields. Web scripts embedded into the vulnerable fields this way are executed immediately when a user logs into the admin page. This affects /admin/wifi/wlan1 and /admin/wifi/wlan_guest.