Multiple vulnerabilities on Meta4 HR from Cegid

An Unrestricted Upload of File vulnerability has been found on Cegid Meta4 HR, that allows an attacker to upload malicios files to the server via '/config/espanol/update_password.jsp' file. Modifying the 'M4_NEW_PASSWORD' parameter, an attacker could store a malicious JSP file inside the file directory, to be executed the the file is loaded in the application.