TL;DR: short URLs produced by bit.ly, goo.gl, and similar services are so short that they can be scanned by brute force. scan discovered a large number of Microsoft OneDrive accounts with private documents. Many of these accounts are unlocked and allow anyone to inject malware that will be automatically downloaded to users’ devices. also discovered many driving directions that reveal sensitive information for identifiable individuals, including their visits to specialized medical facilities, prisons, and adult establishments.
https://freedom-to-tinker.com/blog/vitaly/gone-in-six-characters-short-urls-considered-harmful-for-cloud-services/

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