The route lookup process in beego before 1.12.9 and 2.x before 2.0.3 allows attackers to bypass access control. When a /p1/p2/:name route is configured, attackers can access it by appending .xml in various places (e.g., p1.xml instead of p1).
https://github.com/beego/beego/tree/v2.0.2
https://github.com/beego/beego/issues/4946