Exposure of Sensitive Information to an Unauthorized Actor
PyBlosxom before 1.3.2, when running on certain webservers, allows remote attackers to read arbitrary files via an HTTP request with multiple leading / (slash) characters, which is accessed using the PATH_INFO variable.
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.