According to Bleeping Computer, there's "a security flaw could allow attackers to run malicious code on users' Windows computers and, potentially, take over control".
Users of the software are advised to update as soon as possible.
Foxit was my go-to PDF reader for a long time when I was a Windows user. Then they began distributing their software with opt-out bundleware. It's sad to see how far they've fallen.
There are many other PDF readers available with a quick search, some are open source and much safer. Most browsers can open and print PDF files with little trouble.
Check out the article in full on Bleeping computer.