WatchGuard Firebox and XTM appliances allow an unauthenticated remote attacker to retrieve sensitive authentication server settings by sending a malicious request to exposed authentication endpoints. This is fixed in Fireware OS 12.8.1, 12.5.10, and 12.1.4.
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2022-00017