Due to the flaws in the case-sensitive parameters of the mailsms module of the Coremail mail system, an attacker can use this vulnerability to obtain the system configuration file of the Coremail server through remote access to the URL address without authorization, resulting in sensitive system configuration such as database connection parameters. Information leakage. This rule supports to defend the A6: Vulnerable and Outdated Components of OWASP Top 10 - 2021. Other reference:None