At some point during my career sharing files and links in email became a security concern. There were all sorts of malware problems and issues that spread throughout organizations because someone unknowingly clicked on or forwarded a malicious item. At a couple of large organizations, we had to turn off email for days while we cleaned out systems. Fortunately, antivirus and other types of scanning software improved to prevent most of these problems. It seems that not all developers learned the lessons of the past. Microsoft Teams has a few vulnerabilities inside it based on link sharing in the chats. One of the issues is that the preview features aren't well implemented, though Microsoft security doesn't think this is a problem as a user would notice the link would be incorrect. I think that's a huge leap and not a very safe one to make. Read the rest of Teams Security Issues