FCKeditor 2.6.10 Cross Site Scripting

Related Vulnerabilities: CVE-2012-4000  
Publish Date: 03 Jun 2014
Author: Robin Bailey

            Class    Cross-Site Scripting
Remote  Yes
Published  2nd June 2014
Credit    Robin Bailey of Dionach (vulns@dionach.com)
Vulnerable  FCKeditor <= 2.6.10

FCKeditor is prone to a reflected cross-site scripting (XSS) vulnerability due to inadequately sanitised user input. An attacker may leverage this issue to run JavaScript in the context of a victim's browser.

FCKeditor 2.6.10 is known to be vulnerable; older versions may also be vulnerable. 

Note that this issue is related to CVE-2012-4000, which was a cross-site scripting vulnerability in the values of the textinputs[] array passed to the spellchecker.php page. To resolve this issue the values of this array were encoded with htmlspecialchars() before being output to the page; however the array keys were still echoed unencoded.


POST http://[target]/editor/dialog/fck_spellerpages/spellerpages/server-scripts/spellchecker.php

The vendor was notified of this issue, and FCKeditor 2.6.11 was released to address this vulnerability. See the following vendor announcement:



28/05/2014  Vulnerability identified
28/05/2014  Initial vendor contact
28/05/2014  Vendor response to contact
28/05/2014  Vulnerability disclosed to vendor
29/05/2014  Vendor confirms vulnerability
02/06/2014  Vendor releases patch
02/06/2014  Public disclosure of vulnerability


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