Multiple cross-site scripting (XSS) vulnerabilities in Check_MK before 1.2.2p3 and 1.2.3x before 1.2.3i5 allow remote authenticated users to inject arbitrary web script or HTML via the (1) agent string for a check_mk agent a (2) crafted request to a monitored host which is not properly handled by the logwatch module or other unspecified vectors.