The Quiz Maker Business, Developer, and Agency plugins for WordPress is vulnerable to SQL Injection via the ‘id’ parameter in all versions up to, and including, 8.8.0 (Business), up to, and including, 21.8.0 (Developer), and up to, and including, 31.8.0 (Agency) due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. NOTE: The three variations of this software (Business, Developer, and Agency) share the same plugin slug, so you may get an alert even if you are running the latest version of any of the pieces of software. In these cases it is safe to dismiss the notice once you've confirmed your site is on a patched version of the applicable software.

The Quiz Maker WordPress plugin before 6.5.9.9 does not sanitize and escape some of its settings, which could allow high-privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfilteredhtml capability is disallowed (for example in multisite setup)

The Quiz Maker Business, Developer, and Agency plugins for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'ayssavegooglecredentials' function in all versions up to, and including, 8.8.0 (Business), up to, and including, 21.8.0 (Developer), and up to, and including, 31.8.0 (Agency). This makes it possible for unauthenticated attackers to modify the Google Sheets integration credentials within the plugin's settings. Because the 'clientid' parameter is not sanitized or escaped when used in output, this vulnerability could also be leveraged to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.