The Quiz and Survey Master (QSM) WordPress plugin before 11.2.2 does not properly escape a question setting before outputting it into an unquoted HTML attribute, allowing users with contributor-level access and above to inject arbitrary JavaScript that executes in the browser of any user viewing the affected quiz.
https://wpscan.com/vulnerability/ba8f3e6b-c2c9-4e72-825c-b98b4330c254/