The Quiz And Survey Master WordPress plugin before 8.1.11 does not properly sanitize and escape question titles, which could allow users with the Contributor role and above to perform Stored Cross-Site Scripting attacks
https://www.onvio.nl/nieuws/research-day-discovering-vulnerabilities-in-wordpress-plugins
https://wpscan.com/vulnerability/6f884688-2c0d-4844-bd31-ef7085edf112