Username enumeration is possible through Bypassing CAPTCHA in On-premise SureMDM Solution on Windows deployment allows attacker to enumerate local user information via error message. This issue affects SureMDM On-premise: 6.31 and below version
https://www.42gears.com/security-and-compliance
http://packetstormsecurity.com/files/177179/SureMDM-On-Premise-CAPTCHA-Bypass-User-Enumeration.html