🔹 PHP is a language used to make ~70% of websites. A backdoor has been found allowing an attacker access to any PHP server.

This is so severe that current advice is to take down PHP sites until the fix is released.

When it is released, it only fixes current supported PHP versions. Around half of PHP-based sites still use older versions than this, and they will remain vulnerable until they’re upgraded. (Which may be hard for particularly old software)