On iOS and Android devices, the ShoreTel Mobility Client app version 9.1.3.109 fails to properly validate SSL certificates provided by HTTPS connections, which means that an attacker in the position to perform MITM attacks may be able to obtain sensitive account information such as login credentials.
ShoreTel Mobility Client iOS application versions 9.1.2.101 and below do not validate the SSL certificate they receive when connecting to the mobile application login server.