There’s a vulnerability in macOS that could allow malicious individuals to take over control of your Mac. Apple was supposed to have fixed the issue, but it appears that the exploit is still very much active and dangerous.
Park Minchan, an independent security researcher, discovered a vulnerability in the operating system that lets threat actors control your device. Basically, shortcut files with the .inetloc extension can have commands embedded inside them, which can execute all sorts of things.
If someone sends you a file with the .inetloc extension and you open it on Big Sur or older versions of the OS, the file can execute commands with no other interaction on your part.