It has been discovered that the extension "HTML5 Video Player" (html5videoplayer) is susceptible to Cross-Site Scripting.
Release Date: November 11, 2016
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: version 6.7.0 and below
Vulnerability Type: Cross-Site Scripting
Solution: An updated version 6.7.1 is available from the TYPO3 Extension Manager and at <https://typo3.org/extensions/repository/download/html5videoplayer/6.7.1/t3x/>. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to Stephan Großberndt who discovered and reported the vulnerability.