Available now, title update 1.09 features "Improved anti-cheat measures" and introduced fixes for "several GTA$ and RP exploits" for Grand Theft Auto 5's online multiplayer component. GTA Online allows players to purchase in-game cash through an in-game store or earn it through doing activities.
To address in-game money exploits and hacks, Rockstar regularly does "sweeps" to catch cheaters and modders and "to reverse any illegitimate transactions." Sweeps are achieved through "in-game automated detection, examination of suspicious gameplay statistics, and also manually-reviewed evidence submitted by the Community."
Rockstar released an update for GTA Online late last month, adding four new team based modes and 20 new jobs. The update also patched an exploit introduced in Update 1.06 where players could sell their cars an infinite number of times, potentially earning them millions in the virtual currency.