In Nagios XI 5.6.9, an authenticated user is able to execute arbitrary OS commands via shell metacharacters in the id parameter to schedulereport.php, in the context of the web-server user account.

Nagios XI before 5.6.6 allows remote command execution as root. The exploit requires access to the server as the nagios user, or access as the admin user via the web interface. The getprofile.sh script, invoked by downloading a system profile (profile.php?cmd=download), is executed as root via a passwordless sudo entry; the script executes check_plugin, which is owned by the nagios user. A user logged into Nagios XI with permissions to modify plugins, or the nagios user on the server, can modify the check_plugin executable and insert malicious commands to execute as root.

Nagios XI before 5.5.4 has XSS in the auto login admin management page.

In Nagios XI 5.6.9, XSS exists via the nocscreenapi.php host, hostgroup, or servicegroup parameter, or the schedulereport.php hour or frequency parameter. Any authenticated user can attack the admin user.

A cross-site scripting vulnerability exists in Nagios XI before 5.5.4 via the 'name' parameter within the Account Information page. Exploitation of this vulnerability allows an attacker to execute arbitrary JavaScript code within the auto login admin management page.

An Insufficient Access Control vulnerability (leading to credential disclosure) in coreconfigsnapshot.php (aka configuration snapshot page) in Nagios XI before 5.5.4 allows remote attackers to gain access to configuration files containing confidential credentials.

Nagios XI 5.6.1 allows SQL injection via the username parameter to login.php?forgotpass (aka the reset password form). NOTE: The vendor disputes this issues as not being a vulnerability because the issue does not seem to be a legitimate SQL Injection. The POC does not show any valid injection that can be done with the variable provided, and while the username value being passed does get used in a SQL query, it is passed through SQL escaping functions when creating the call. The vendor tried re-creating the issue with no luck

Privilege escalation in Nagios XI before 5.5.11 allows local attackers to elevate privileges to root via write access to config.inc.php and import_xiconfig.php.

Cross-site scripting (XSS) vulnerability in Nagios XI before 5.5.11 allows attackers to inject arbitrary web script or HTML via the xiwindow parameter.

SQL injection vulnerability in Nagios XI before 5.5.11 allows attackers to execute arbitrary SQL commands via the API when using fusekeys and malicious user id.