Release Date: November 07, 2017
Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
Affected Versions: version 5.0.0 and below
Vulnerability Type: Cross-Site Scripting
CVE: not assigned yet
Problem Description: The extension uses an old version of PHPMailer, which is known to be vulnerable to Cross-Site Scripting (CVE-2017-11503).
Solution: An updated version 5.0.1 is available from the TYPO3 Extension Manager and at https://extensions.typo3.org/extension/download/multishop/5.0.1/zip/. Users of the extension are advised to update the extension as soon as possible.
Credits: Credits go to David Münter who discovered and reported the vulnerability.