Multiple cross-site scripting (XSS) vulnerabilities in b2evolution 1.8.2 through 1.9 beta allow remote attackers to inject arbitrary web script or HTML via the (1) app_name parameter in (a) _404_not_found.page.php, (b) _410_stats_gone.page.php, and (c) _referer_spam.page.php in inc/VIEW/errors/; the (2) baseurl parameter in (d) inc/VIEW/errors/_404_not_found.page.php; and the (3) ReqURI parameter in (e) inc/VIEW/errors/_referer_spam.page.php.