PS4 exploits: the status for 5.5x owners (5.50, 5.53, 5.55) - Wololo.net
group bigboss-kys on Twitter: "The status of PS4 Hacking If you own a PS4 running firmware 4.55 or lower, congratulations, you can Jailbreak your PS4 and do a bunch of cool stuff
GitHub - ChendoChap/ps4-ipv6-uaf
PS4 Firmware 4.55 Modified to Be Compatible with Firmware 5.50
PS4 Exploit: 5.05 Webkit exploit released, 4.55 functional Jailbreak probably only a matter of days - Wololo.net