PS4 Notification Tool release, developer @Wultra (aka C0rpVultra on Twitter) has been testing vulnerabilities and found that a JSC_ConcatMemcpy_InfoLeak WebKit exploit reported by externalist affects PlayStation 4 consoles running PS4 Firmware 6.00, PS4 Firmware 6.02 and even Sony's latest PS4 Firmware 6.10 Beta system software and documented these findings on his repository below with a PS4_JSC_ConcatMemcpy_POC.
Download: PS4_jsc_ConcatMemcpy_POC-master.zip / Live Demo / Mirror by @EdiTzZ / GIT / CVE-2018-4358
Needless to say this is a 6.XX PS4 WebKit (Userland) exploit and not a Kernel-level exploit, meaning until a fully implemented 6.XX Kernel exploit is publicly available you won't be able to jailbreak these PlayStation 4 consoles so don't update!
PS4 6.02 Webkit InfoLeak Meme - [object Object] address: 0x200f88100
From the ReadMe.md: PS4_JSC_ConcatMemcpy_POC
Works on 6.xx firmware.. Exploited function does not exist on lower FW(s), meaning it does not work on them.
And from GithubUserContent.com via externalist:
Firmware Webkit Version Vulnerable? 6.20 605.1.15 Yes 6.10 Beta 605.1.15 Yes 6.02 605.1.15 Yes 6.00 605.1.15 Yes 5.55 601.2 No 5.53 601.2 No 5.50 601.2 No 5.07 601.2 No
JSC_ConcatMemcpy_InfoLeak Patched in 6.50 Beta