Multiple cross-site scripting (XSS) vulnerabilities in Insanely Simple Blog 0.5 and earlier allow remote attackers to inject arbitrary web script or HTML via (1) the search action, possibly related to the term parameter to index.php; or (2) an anonymous blog entry, possibly involving the (a) posted_by, (b) subject, and (c) content parameters to index.php; as demonstrated by the onmouseover attribute of certain elements.  NOTE: some of these details are obtained from third party information.