Endpoint Vulnerability

Entering fullscreen and persistent pointerlock without user permission


Security researcher sushi Anton Larsson reported that when paired fullscreen and pointerlock requests are done in combination with closing windows, a pointerlock can be created within a fullscreen window without user permission. This pointerlock cannot then be cancelled without terminating the browser, resulting in a persistent denial of service attack. This can also be used for spoofing and clickjacking attacks against the browser UI.

Affected Products

Firefox ESR