Short URLs have become a common way to solve the problem of massive Web addresses, simplifying the process of recall and access. But new research suggests the ease of shorter URLs may be long on problems when it comes to cloud storage and collaboration. Researchers found that short URLs using just five- or seven-character tokens made it possible for attackers to scan the entire set of shortened addresses governed by the same ruleset. Facebook has created its own URL shortener, which is now being used in conjunction with Messenger to streamline social communication.”]
Source: https://securityintelligence.com/news/cloud-complications-short-urls-come-with-big-problems/