Burak Kelebek, July 2016

Cross-Site Scripting in Link Library WordPress Plugin


A Reflected Cross-Site Scripting (XSS) vulnerability has been found in the Link Library plugin. By using this vulnerability an attacker can inject malicious JavaScript code into the application, which will execute within the browser of any logged-in admin.


For feedback or questions about this advisory mail us at sumofpwn at securify.nl

The Summer of Pwnage

This issue has been found during the Summer of Pwnage hacker event, running from July 1-29. A community summer event in which a large group of security bughunters (worldwide) collaborate in a month of security research on Open Source Software (WordPress this time). For fun. The event is hosted by Securify in Amsterdam.



Tested versions

This issue was successfully tested on Link Library version


This issue is fixed in version


Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted web sites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user. Flaws that allow these attacks to succeed are quite widespread and occur anywhere a web application uses input from a user within the output it generates without validating or encoding it. Reflected XSS occurs when user input is immediately returned by a web application in an error message, search result, or any other response that includes some or all of the input provided by the user as part of the request

"successimportcount" and "sucessupdatecount" fields do not validate <script> tags and do not perform output encoding.


885: echo echo "<div id='message' class='updated fade'><p><strong>" . ($_GET['successimportcount'] : '0') . " " . __('link(s) imported', 'link-library') . ", " . ($_GET['successupdatecount'] : '0') . " " . __('link(s) updated', 'link-library') . ".</strong></p></div>";

Proof of concept

http://<targetsite>/wp-admin/admin.php?page=link-library-settingssets&messages=9&successimportcount=1" /><script>alert(1)</script>&currenttab=importexport