Sammy Forgit has discovered a vulnerability in the Knews Multilingual Newsletters plugin for WordPress, which can be exploited by malicious people to conduct cross-site scripting attacks.
Input passed via the "ff" parameter to wp-content/plugins/knews/wysiwyg/fontpicker/index.php is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
The vulnerability is confirmed in version 1.1.0. Other versions may also be affected.
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