The stylish-cost-calculator-premium WordPress plugin before 7.9.0 does not sanitise and escape a parameter before outputting it back in the page, leading to a Stored Cross-Site Scripting which could be used against admins when viewing submissions submitted through the Email Quote Form.
https://wpscan.com/vulnerability/73353221-3e6d-44e8-bf41-55a0fe57d81f