New World was completely broken today – Dupes, Crashes and more [video]
youtube.com
youtube.com
Basically Amazon's MMO New World has had numerous issues in trusting the client side UI code. This latest is that the chat box takes unsanitised HTML. This allows a variety of visual bugs, crashing game clients, and fake quest completions for infinite rewards.
This is on top of other recent bugs such as not receiving money for sales when offline, moving the window to 'pause' the game state and avoid damage, and other weird behaviour.
This is very a basic game development tenet - never trust the client. To see a company known for its APIs make all these mistakes is baffling.