Verizon Call Filter API Flaw Exposed Customers' Incoming Call History

A vulnerability in Verizon's Call Filter feature allowed customers to access the incoming call logs of another Verizon Wireless number through an unsecured API request. This flaw exposed customers' incoming call histories, which could include sensitive information such as the phone numbers of callers and the times of calls. The vulnerability was discovered and reported by a security researcher, leading Verizon to fix the issue. The specific technical details of the vulnerability have not been disclosed.