Here's the google translate version of what Eskarina posted:
Quote
Hello, Since yesterday evening at around 20h, 2 vulnerabilities are exploited heavily involved The first is related to the guild badge that can accumulate bonus enhancing Wisdom, Prospecting and damage by using a bug related to the allocation of experience to his guild. The second is associated with a bug in confronting Vampyro loop. Several players took the opportunity to gain experience and rare items in a massive way. These two faults have been used extensively involved, we are forced to rollback tomorrow when the update of 14h, which will allow us to apply a patch. The exploit was made public yesterday evening around 20h on the forums, the rollback will be approximately 48 hours. Regarding compensation that will follow the rollback, we can give you more details tomorrow during the day. We present our apologies for the inconvenience