Fallout 76’s PC version could be worryingly vulnerable to hacking according to claims from some players with beta access, and Bethesda is “aware and investigating.”
A thread on the Fallout subreddit reports that Fallout 76 is basically as easy to mod as Fallout 4, and that the servers don’t actually check to verify if client-side files have been modified. That means modders could convert existing Fallout 4 mods to work with Fallout 76 and then play with them online without issue, or make entirely new ones that offer an unfair advantage.
Source: IGN.com Fallout 76 May Be Wide Open for Hacks and Malicious Mods