While there is no fix available at the moment, there are steps you can take to prevent the issue affecting you.
Some PlayStation 4 users are reporting that they are receiving a message from an unknown party that is essentially "bricking" their consoles.
"Rainbow Six: Siege" and "Destiny 2" players encountered this issue when their opponents sent these messages during competitive multiplayer matches, forcing them to lose their games, as well as their consoles.
Many PlayStation 4 owners had to "factory reset" their consoles, which caused them to lose any data not stored in the cloud or elsewhere.
You might want to change your PlayStation message options to avoid a potential system breaking hack.
According to an email received by VG247, the company is "aware of the situation and are planning a system software update to resolve this problem".
Until Sony get round to releasing a hotfix please make sure you update your messaging settings on your PlayStation 4.
The good news is prevention is as simple as changing a setting in the menu. As suggested by user tizorres in another Reddit thread, PS4 players are encouraged to go into their privacy settings and set their messaging preference to "Friends" or "No One". As of this morning, Sony has issued the following statement about the issue... Even deleting the message from the mobile app doesn't work. Then, choose "Initialise PS4" option int he safe mode.
I bet we all remember at least one weird looking iPhone message that made its way round the smartphone community, automatically restarting mobiles when opened. Here are official instructions via Sony: "Once the PS4 system is off, press and hold the power button again".
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