Multiple cross-site request forgery (CSRF) vulnerabilities in Pligg before 1.0.3 allow remote attackers to hijack the authentication of administrators for requests that create user accounts or have unspecified other impact.

Multiple cross-site scripting (XSS) vulnerabilities in Pligg before 1.0.3 allow remote attackers to inject arbitrary web script or HTML via the HTTP Referer header to (1) admin/admin_config.php, (2) admin/admin_modules.php, (3) delete.php, (4) editlink.php, (5) submit.php, (6) submit_groups.php, (7) user_add_remove_links.php, and (8) user_settings.php.

Multiple open redirect vulnerabilities in Pligg 1.0.2 and earlier allow remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via the (1) return parameter to pligg/login.php and the (2) HTTP Referer header to user_settings.php.

Cross-site scripting (XSS) vulnerability in Pligg 9.9 and earlier allows remote attackers to inject arbitrary web script or HTML via the keyword parameter in a search action to user.php and other unspecified vectors.

Multiple directory traversal vulnerabilities in Pligg 9.9 and earlier allow remote attackers to (1) determine the existence of arbitrary files via a .. (dot dot) in the $tb_url variable in trackback.php, or (2) include arbitrary files via a .. (dot dot) in the template parameter to settemplate.php.

Multiple SQL injection vulnerabilities in Pligg 9.9 and earlier allow remote attackers to execute arbitrary SQL commands via the (1) id parameter to vote.php, which is not properly handled in libs/link.php; (2) id parameter to trackback.php; (3) an unspecified parameter to submit.php; (4) requestTitle variable in a query to story.php; (5) requestID and (6) requestTitle variables in recommend.php; (7) categoryID parameter to cloud.php; (8) title parameter to out.php; (9) username parameter to login.php; (10) id parameter to cvote.php; and (11) commentid parameter to edit.php.

Multiple SQL injection vulnerabilities in submit.php in Pligg CMS 9.9.5 allow remote attackers to execute arbitrary SQL commands via the (1) category and (2) id parameters.

SQL injection vulnerability in evb/check_url.php in Pligg CMS 9.9.5 Beta allows remote attackers to execute arbitrary SQL commands via the url parameter.

Cross-site scripting (XSS) vulnerability in index.php in Pligg 9.9.5 allows remote attackers to inject arbitrary web script or HTML via the category parameter.

The CAPTCHA implementation in (1) Pligg 9.9.5 and possibly (2) Francisco Burzi PHP-Nuke 8.1 provides a critical random number (the ts_random value) within the URL in the SRC attribute of an IMG element, which allows remote attackers to pass the CAPTCHA test via a calculation that combines this value with the current date and the HTTP User-Agent string.