With The Division 2 maintenance now over, Ubisoft has also rolled out a client-side update (no download required) that fixes a lot of things in the game, which includes the Supply Drop exploit.
Check out The Division 2 patch notes for the March 16, 2019 server-side update:
Bug fixes
- Implemented a fix that should reduce occurrences of client crashes when using skills
- Fixed an issue where players could be stuck in the wrong World Tier if they completed Strongholds without meeting the required Gear Score while in a group
- Fixed an issue where players wouldn’t be able to talk to agent Kelso at the Castle Settlement
- Fixed an issue where players could obtain multiple Ivory Keys from the same source
- Fixed an issue where map progress would not be saved when completing Open World activities and Side missions in another players’ instance.
- Fixed an exploit that allowed players to loot Supply Drops multiple times
- Fixed a bug where players could buy blueprints repeatedly at the vendors by logging out and back in
- Fixed an issue where combining the Dialed in talent with the Emet Mask could lead to greatly increased Accuracy and Stability
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Source: Ubisoft Forums