Multiple cross-site scripting (XSS) vulnerabilities in HydroBB 1.0.0 Beta 2 allow remote attackers to inject arbitrary web script or HTML via the s parameter to (1) search.php, (2) members.php, (3) stats.php, (4) viewforum.php, (5) register.php, (6) usercp.php, (7) groups.php, (8) pms.php, and (9) calendar.php.