https://www.pcgamer.com/destiny-2-forsaken-players-who-used-exploits-to-get-raid-gear-early-wont-be-punished/

Destiny 2's next raid, Last Wish, won't arrive until this Friday, but some players have already looted everything in it thanks to a newly discovered exploit. 

Reddit user ozberk and their clan found a way to glitch into a section of Last Wish via the Dreaming City, the end-game hub in the Forsaken expansion. After some extensive poking around, they discovered a raid chest which dropped raid-exclusive armor and weapons.