Release Date: May 31, 2016
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: 0.9.6 and below
Vulnerability Type: Information Disclosure
Suggested CVSS v2.0: AV:N/AC:M/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
Problem Description: The extension discloses personal data of newsletter subscribers. Such data might be cached and indexed by search engines.
Solution: An updated version 0.9.7 is available from the TYPO3 Extension Manager and at https://typo3.org/extensions/repository/download/mmc_directmail_subscription/0.9.7/t3x/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to Loek Hilgersom who discovered the vulnerability.