2nd Line Android App version v1.2.92 and before (package name com.mysecondline.app), developed by AutoBizLine, Inc., contains an improper access control vulnerability in its authentication mechanism. The server only validates the first character of the user_token, enabling attackers to brute force tokens and perform unauthorized queries on other user accounts. Successful exploitation could result in privacy breaches and unauthorized access to user data.

The incomplete verification mechanism in the AutoBizLine com.mysecondline.app 1.2.91 allows attackers to log in as other users and gain unauthorized access to their personal information.