The upcoming Textpattern 4.9 release will include some notable changes that affect older systems, including web servers running older versions of PHP and computers using Internet Explorer.
Before submitting a perceived security vulnerability or XSS exploit through our security email address, please review the items in this article that we do not consider to be weaknesses in Textpattern.
This blog post outlines a now-resolved oversight relating to archive download checksums for Textpattern 4.7.3. Consider it informational, no action is required on your part.