Fix version checked and add reference

Author: jvazquez-r7

modules/exploits/unix/webapp/php_wordpress_total_cache.rb

@@ -38,6 +38,7 @@ def initialize(info = {})
 				[
 					[ 'OSVDB', '92652' ],
 					[ 'BID', '59316' ],
+					[ 'URL', 'http://wordpress.org/support/topic/pwn3d' ],
 					[ 'URL', 'http://www.acunetix.com/blog/web-security-zone/wp-plugins-remote-code-execution/' ]
 				],
 			'Privileged'     => false,
@@ -230,7 +231,7 @@ def check
 
 		if res.headers['X-Powered-By'] and res.headers['X-Powered-By'] =~ /W3 Total Cache\/([0-9\.]*)/
 			version = $1
-			if version <= "0.9.2.3"
+			if version <= "0.9.2.8"
 				return Exploit::CheckCode::Vulnerable
 			else
 				return Exploit::CheckCode::Safe