Exposure of Sensitive Information to an Unauthorized Actor
RunCMS 2M1, when running with certain error_reporting levels, allows remote attackers to obtain sensitive information via (1) the op parameter to modules/contact/index.php or (2) uid parameter to userinfo.php, which leaks the installation path in an error message when these parameters are used in a call to the preg_match function.
CWE-200 - Information Exposure
An information exposure vulnerability is categorized as an information flow (IF) weakness, which can potentially allow unauthorized access to otherwise classified information in the application, such as confidential personal information (demographics, financials, health records, etc.), business secrets, and the application's internal environment.