Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: Version 1.4.0 and below
Vulnerability Types: SQL Injection, Cross-Site Scripting
Release Date: October 25, 2012
Update: November 20, 2012 (replaced link to Security Cookbook by link to Security Guide)
Problem Description: Failing to properly sanitize user input, formhandler is susceptible to SQL Injection. An attacker could delete arbitrary database tables. Editors rights with permission to use the formhandler backend module are required for this to work.
Failing to encode user data for the HTML output, formhandler is susceptible to Cross Site Scripting. No authentication is required to exploit this vulnerability.
Solution: An updated version 1.4.1 is available from the TYPO3 extension manager and at typo3.org/extensions/repository/view/formhandler/1.4.1/.
Credits: Thanks to Sven Krewitt who discovered and reported this issue.