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The hole makes it possible for a hacker to use social-engineering tactics to trick users into exposing their data. The OAuth protocol itself requires tweaking to remove the vulnerability, and a source close to OAuth's development team said that there have been no known violations, that it has been aware of it for a few days now, and has been coordinating responses with vendors. A solution should be announced soon.

This is a particularly big deal for Twitter, as OAuth prevents users of a service from having to hand over their passwords to third-party services that use that service's application program interface (API), and Twitter relies heavily on developer-created enhancements to the service from clients like Twhirl and TweetDeck to statistics and analytics applications.