It has been discovered that the extension Formhandler (formhandler) is vulnerable to SQL-Injection and Cross-Site Scripting.
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: Version 0.9.14 and below
Vulnerability Types: SQL Injection, Cross-Site Scripting
Release Date: 25.08.2011
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. Exploiting this issue is not possible in the default configuration since formhandler performs several filters on the entered data. But it is possible to turn this filter off in the TypoScript configuration.
Solution: An updated version 0.9.15 is available from the TYPO3 extension manager and attypo3.org/extensions/repository/view/formhandler/0.9.15/.
Credits: Thanks to Jens Hoffrichter who discovered and reported this issue.