CVE-2026-73664 FreePBX: Authenticated Arbitrary SSH Key Injection via Backup Module

FreePBX is an open source IP PBX. From 17.0.5.34 until 17.0.11, the publicKeySave AJAX endpoint in Backup.class.php accepts an authenticated administrator's SSH public key and appends it to /home/asterisk/.ssh/authorizedkeys for the asterisk system user without reliably enforcing backup-only...