Monitorix 3.13.0 allows remote attackers to bypass Basic Authentication in a default installation (i.e., an installation without a hostsdeny option). This issue occurred because a new access-control feature was introduced without considering that some exiting installations became unsafe, upon an update to 3.13.0, unless the new feature was immediately configured.

Cross-site scripting (XSS) vulnerability in the handlerequest function in lib/HTTPServer.pm in Monitorix before 3.4.0 allows remote attackers to inject arbitrary web script or HTML via the PATHINFO.

The handlerequest function in lib/HTTPServer.pm in Monitorix before 3.3.1 allows remote attackers to execute arbitrary commands via shell metacharacters in the URI.

Monitorix before 3.10.1 allows XSS via CGI variables.