insane is a whitelist-oriented HTML sanitizer. Versions 2.6.2 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no known patches are available.

Multiple SQL injection vulnerabilities in Insanely Simple Blog 0.5 and earlier allow remote attackers to execute arbitrary SQL commands via the current_subsection parameter to index.php and other unspecified vectors.

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.