The vulnerability is something new in hacking techniques, i called it Remote Code Crush (RCC) . 

Vulnerability Name: Facebook Remote Code Crush

Coded By : Khalil Shreateh

What is RCC Vulnerability ?

This type of vulnerabilities are different that Remote Code Execution (RCE) [The ability an attacker has to access someone else's computing device and make changes, no matter where the device is geographically located]. While RCC can change part of web application codes. 

Exploit

First i created a new post, then i tagged users on that post, after that i send a custom Payload to crush the tagged post . the tagged users (victims) will have no control on that post, they can not untag themselves, report it or even stop its notifications, because i crushed the post menu. 

RCC Screenshot: Menu crushed, replaced with "There was an error processing your request."

POC

This video recorded in both English and Arabic language, enjoy watching