Release Date: March 03, 2016
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: version 1.0.0 and below
Vulnerability Type: Cross-Site Scripting
Problem Description: This extension is a fork from the extension weeaar_googlesitemap.As the original extension this fork is susceptible to Cross-Site Scripting.
Solution: Versions of this extension that are known to be vulnerable will no longer be available for download from the TYPO3 Extension Repository. The extension author failed in providing a security fix for the reported vulnerability in a decent amount of time. Please uninstall and delete the extension from your installation.
Credits: Credits go to Frederic Gaus who reported the vulnerability.