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 3.0.x prior to 3.0.6 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 3.0.6 or later.