The security vendor’s appliance suffers from an authentication-bypass issue.
https://threatpost.com/critical-sophos-security-bug-rce-firewalls/179127/
Attackers exploiting bugs in the “link preview” feature in Microsoft Teams could abuse the flaws to spoof links, leak an Android user’s IP address and launch a DoS attack.
https://threatpost.com/microsoft-teams-bugs-vulnerable-march/177225/