Rule Definition
Developers may assume that inputs such as cookies, environment variables, and hidden form fields cannot be modified. However, an attacker could change these inputs using customized clients or other attacks. This change might not be detected. When security decisions such as authentication and authorization are made based on the values of these inputs, attackers can bypass the security of the software. Without sufficient encryption, integrity checking, or other mechanism, any input that originates from an outsider cannot be trusted.

Remediation
Do NOT USE getRequestedSessionId.

Violation Code Sample

if(isActiveSession(request.getRequestedSessionId()) ){ 
               ... 
              }

Fixed Code Sample

Do NOT USE getRequestedSessionId.

http://cwe.mitre.org/data/definitions/807 OWASP 2017 Category A2 - Broken Authentication