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SEOTOASTER 'lastname' Cross Site Scripting Vulnerability

HTTPCS149 SEOTOASTER 2.2.0 2014-04-15 Less Critical A vulnerability has been discovered in SEOTOASTER, which can be exploited by malicious people to conduct cross-site scripting attacks. Input passed via the 'lastname' parameter to '/checkout-page.html' is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site. /checkout-page.html firstname=a&lastname=[VulnHTTPCS]&phone=1&email=a@b.com&step=pickup&submitpickup=Next XSS POST The vendor did not propose a solution yet. Sanitization of the field "lastname" is required. https://www.httpcs.com/it/advisory/httpcs149 HTTPCS [Web Vulnerability Scanner]