Multiple cross-site scripting (XSS) vulnerabilities in index.php in Kayako SupportSuite 3.00.26 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) nav parameter in the downloads module, (2) Full Name and (3) Email fields in the core module, (4) Full Name, (5) Email, and (6) Subject fields in the tickets module, or (7) Registered Email field in the lostpassword feature in the core module.