Twitter clients stay signed in with pre-breach passwords

OAuth means apps can connect despite reset of passwords made unsafe by breach

Twitter has detected a breach and suggested 250,000 users change their passwords. Yet users who heed that advice will still find that apps using the Twitter API, including the company's own, allow access to the service without asking users to enter the new password.
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A password change performed on the web did not, however, cause Twitter's own apps for iPad (under iOS 5.1.1 on an iPad 1) or iOS (under iOS 6 on an iPhone 5) to prompt us for the new password. Instead, it remained possible to post tweets from both.
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Other users of Twitter's iOS app confirmed the same issue, one telling The Reg that only after he deleted and re-installed the app was he prompted for a new password.
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Twitter spokesperson Jim Prosser did not deny that clients can continue to access the service even after passwords have been changed, and told The Reg, by email, that “TweetDeck and other clients use [open authentication standard] OAuth, so as long as you don't sign out, you don't have to re-input your credential every time you open the app.”
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