perturb.org XSS vulnerability

perturb.org XSS vulnerability. Affected website: perturb.org, Vulnerable application: Custom Code, Vulnerability type: XSS (Cross Site Scripting) / CWE-79, CVSSv3 Score: 6.1, Coordinated Disclosure based on ISO 29147 guidelines, OWASP XSS Prevention Cheat Sheet. Vulnerable URL: http://perturb.org/search.php?search=%3C/script%3E%3E%3Cscript%3Eprompt(1)%3C/script%3E. Coordinated Disclosure Timeline: Vulnerability reported: 14 February, 2018 11:29 GMT, Vulnerability Verified: 14 February, 2018 11:36 GMT, Website Operator Notified: 14 February, 2018 11:36 GMT, Vulnerability Published: 14 February, 2018 11:36 GMT[without any technical details], Vulnerability Fixed: 31 March, 2018 12:24 GMT, Public Disclosure: 31 March, 2018 12:24 GM