Component Type: Third Party Extension. This extension is third party code that has not been submitted to the TYPO3 extension review process yet. The extension is not part of TYPO3 default installations.
Affected Components: th_mailformplus
Versions: th_mailformplus versions 3.6.1 and earlier
Vulnerability Type: Potential Spam Abuse
A weakness in the form validation of th_mailformplus has been discovered that may be abused to inject additional recipients in mail forms.
An updated version (th_mailformplus version 3.7.0) can be found on typo3.org/extensions/repository/list/th_mailformplus/ or via Extension Manager. All users of this extension are advised to immediatly update.
Thanks to Joerg Schoppet for notifying us; thanks to Peter Luser for immediatly providing a fix.