The FluentSMTP WordPress plugin before 2.2.3 does not sanitize or escape email content, making it vulnerable to stored cross-site scripting attacks (XSS) when an administrator views the email logs. This exploit requires other plugins to enable users to send emails with unfiltered HTML.
- https://wpscan.com/vulnerability/71662b72-311c-42db-86c5-a0276d25535c
- https://github.com/20142995/nuclei-templates