That Pandora account you haven't opened since 2015 is still sitting there, still holding your password, and still fully accessible to anyone who finds their way in. Security researchers call these "zombie" accounts: old profiles nobody uses anymore but that remain active and exploitable.

A study from Secure Data Recovery found that 94% of respondents had at least one account they hadn't touched in over a year. Pandora topped the list of most commonly abandoned services, followed by Groupon and Shutterfly, with photo and........

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