The remote web server is hosting a web application that is vulnerable to an authentication bypass attack vector.
The remote web server hosts Moodle, an open-source course management system. Versions of Moodle 2.7.x prior to 2.7.16 are affected by a flaw that is due to the program failing to invalidate user tokens after a password change is performed. This may allow an attacker who had compromised a user's account to have their access persist after the password has been changed.
Upgrade to Moodle version 2.7.16 or later.