XSS in WordPress
Vulnerability: CSRF attack in WordPress Knews Multilingual Newsletters
Danger: Low
Patch: Yes
Number of vulnerabilities: 1
Vector operation: Remote
Impact: Cross Site Scripting
Affected products: WordPress Knews Multilingual Newsletters Plugin 1.x
Affected versions: Knews WordPress Multilingual Newsletters 1.2.5, possibly earlier.
Description:
The vulnerability allows malicious people to conduct XSS attacks.
The vulnerability is caused due to the lack of authentication of HTTP requests when you perform some action. A remote user can perform CSRF attack and change the e-mail address.
Manufacturer URL: http://wordpress.org/extend/plugins/knews/
Solution: Install the latest version 1.2.6 from the manufacturer.
links:
http://wordpress.org/extend/plugins/knews/changelog/
MALWARELIST.net - Your Information Security Source 
I want to stress especially the “novel” use of the onload function of img/script tags. People in the past have used it to detect the presence of different host-names/”port scanning” internal systems by vectoring through a hooked browser. I say that’s cool and all, but you can take that further and use it to detect the presence of a plugin on a target on demand, making you able to be much more sneaky. When the markup detects a plugin present on the target, it redirects the browser to the exploit, and no further requests can be made by that IP to the script.