A Webkit exploit got released for PS4 1.76:
http://wololo.net/2014/10/24/webkit-exploit-confirmed-to-run-on-ps4-firmware-1-76/
Webkit exploit on 1.76
http://wololo.net/2014/10/24/webkit-exploit-confirmed-to-run-on-ps4-firmware-1-76/
Webkit exploit on 1.76