The World Bank Group's computer network - one of the largest repositories of sensitive data about the economies of every nation - has been raided repeatedly by outsiders for more than a year, FOX News has learned. It is still not known how much information was stolen. But sources inside the bank confirm that servers in the institution's highly-restricted treasury unit were deeply penetrated with spy software last April. Invaders also had full access to the rest of the bank's network for nearly a month in June and July. In total, at least six major intrusions - two of them using the same group of IP addresses originating from China - have been detected at the World Bank since the summer of 2007, with the most recent breach occurring just last month. In a frantic midnight e-mail to colleagues, the bank's senior technology manager referred to the situation as an unprecedented crisis." In fact, it may be the worst security breach ever at a global financial institution. The crisis comes at an awkward moment for World Bank president Robert Zoellick. This weekend, the bank holds its annual series of meetings in Washington - and just in advance of those sessions, Zoellick called for a radical revamping of multilateral organizations in light of the global economic meltdown. Zoellick is positioning himself and the bank as an institution that can help chart a new path toward global financial stability. But that reputation ... depends on the bank's stable information infrastructure. The fact that the information vaults of the World Bank have been repeatedly pried open won't help Zoellick's case.