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Some Web apps have more margin for error than others. For apps that deal with highly personal data – like financial planning applications – that margin is very slim.

Rudder, one of many apps that competes in this space, may have just committed a huge blunder today: sending user’s confidential financial information to the wrong people.

Judging from the emails we’ve seen, account numbers don’t seem to be exposed, but you do get the full details on someone else’s finances – their salary, their debts, their bank balance, and where they shop. Needless to say, this could be a huge breach of security for Rudder users, and would create a difficult to overcome PR nightmare.

Not being active users of Rudder, we can’t confirm this is indeed what’s happening – and if it is, how widespread the issue might be – but we’ve had a number of emails forwarded to us that show the mishap. Additionally, people are talking about it on Twitter, posting their own images and stories documenting the issue.

Rudder is a relatively new entrant to the personal finance space (we compared it head-to-head with Mint late last year), and it has tiny traffic at this point relative to some of the bigger competitors. Nonetheless, an error of this magnitude would be a devastating blow to a company that wants customers to trust them with their most intimate financial details.

We’ve contacted Rudder for comment and will update when we hear something.

Tags: personal finance, Rudder, security