According to a Reddit thread, an exploit in The Elder Scrolls Online allows players to farm unlimited sums of gold. Developer ZeniMax Online Studios has already stepped in to prevent further use of the bug, it's unclear just how much the exploit has thrown off the in-game economy and what can be done to roll back the damage. A similar situation happened with the Diablo III Auction House, which caused trillions in virtual currency to flood the in-game economy.
A Reddit post by user Mistress-Rarity today brought the issue to the attention of the public. The bug has been exploited and well known since the game launched, apparently. In response, ZeniMax disabled access to guild banks early this morning. The most recent patch includes changes to the way auto-stacking in guild banks is handled, which may prevent the exploit from continuing to be used once guild bank access is restored.
ZeniMax has not yet indicated how it plans to address the impact of the exploit.