A vulnerability has been reported in the MailformPlus extension for TYPO3, which can be exploited by malicious people to conduct cross-site scripting attacks.
Certain unspecified input is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
The vulnerability is reported in version 4.0.15 and prior.
Vulnerable Products
Vulnerable Software: MailformPlus (th_mailformplus) Extension for TYPO3 4.x
Solution
Update to version 4.0.16 and the vendor recommends to switch to the follow-up extension "formhandler" due to end of maintenance.