Release Date: June 29, 2015
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: version 2.1.0 and below
Vulnerability Type: Cross-Site Scripting
Severity: Medium
Suggested CVSS v2.0: AV:N/AC:L/Au:N/C:P/I:P/A:N/E:F/RL:O/RC:C (What's that?)
CVE: not assigned yet
Problem Description: The extension fails to properly encode user input for output in HTML context.
Solution: An updated version 2.1.1 is available from the TYPO3 Extension Manager and at http://typo3.org/extensions/repository/download/pagenotfoundhandling/2.1.1/t3x/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to Bas van Beek who discovered and reported the issue.
General advice: Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list to receive future Security Bulletins via E-mail.