In SapphireIMS 4097_1, it is possible to guess the registered/active usernames of the software from the errors it gives out for each type of user on the Login form. For "Incorrect User" - it gives an error "The application failed to identify the user. Please contact administrator for help." For "Correct User and Incorrect Password" - it gives an error "Authentication failed. Please login again."

References

• https://nvd.nist.gov/vuln/detail/CVE-2017-16629
• https://vuln.shellcoder.party/2020/07/18/cve-2017-16629-sapphireims-login-page-information-disclosure/
• https://vuln.shellcoder.party/tags/sapphireims/