Multiple cross-site scripting (XSS) vulnerabilities in FreePBX 2.5.2 and 2.6.0rc2, and possibly other versions, allow remote attackers to inject arbitrary web script or HTML via the (1) tech parameter to admin/admin/config.php during a trunks display action, the (2) description parameter during an Add Zap Channel action, and (3) unspecified vectors during an Add Recordings action.