In Joomla! before 3.8.0, inadequate escaping in the LDAP authentication plugin can result in a disclosure of a username and password.

Joomla! 1.6.0 is vulnerable to SQL Injection via the filterorder and filerorderDir parameters.

Joomla! 1.5.x, 2.x, and 3.x before 3.4.6 allow remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the HTTP User-Agent header, as exploited in the wild in December 2015.

The language file parsing process could be manipulated to expose environment variables. Environment variables might contain sensible information.

Inadequate input validation for media selection fields lead to XSS vulnerabilities in various extensions.

In Joomla! before 3.7.4, inadequate filtering of potentially malicious HTML tags leads to XSS vulnerabilities in various components.

An XSS issue was discovered in the language switcher module in Joomla! 1.6.0 through 3.8.8 before 3.8.9. In some cases, the link of the current language might contain unescaped HTML special characters. This may lead to reflective XSS via injection of arbitrary parameters and/or values on the current page URL.

Unspecified vulnerability in Joomla! 1.6.x and 1.7.x before 1.7.4 allows remote attackers to obtain sensitive information via unknown vectors, a different vulnerability than CVE-2012-0819.

Unspecified vulnerability in Joomla! 1.6.x and 1.7.x before 1.7.4 allows remote attackers to obtain sensitive information via unknown vectors, a different vulnerability than CVE-2012-0821.

Joomla! 1.6.x before 1.6.2 allows remote attackers to obtain sensitive information via an empty Itemid array parameter to index.php, which reveals the installation path in an error message, a different vulnerability than CVE-2011-2488.

Cross-site scripting (XSS) vulnerability in Joomla! 1.6.x and 1.7.x before 1.7.4 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors, a different vulnerability than CVE-2012-0822.

Multiple cross-site scripting (XSS) vulnerabilities in Joomla! before 1.6.4 allow remote attackers to inject arbitrary web script or HTML via (1) the query string to the comcontact component, as demonstrated by the Itemid parameter to index.php; (2) the query string to the comcontent component, as demonstrated by the filterorder parameter to index.php; (3) the query string to the comnewsfeeds component, as demonstrated by an arbitrary parameter to index.php; or (4) the option parameter in a reset.request action to index.php; and, when Internet Explorer or Konqueror is used, (5) allow remote attackers to inject arbitrary web script or HTML via the searchword parameter in a search action to index.php in the comsearch component.

Multiple cross-site scripting (XSS) vulnerabilities in Joomla! 1.6.3 and earlier allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Joomla! 1.6.x before 1.6.2 does not prevent page rendering inside a frame in a third-party HTML document, which makes it easier for remote attackers to conduct clickjacking attacks via a crafted web site.

Multiple cross-site scripting (XSS) vulnerabilities in Joomla! before 1.7.0 allow remote attackers to inject arbitrary web script or HTML via (1) the URI to includes/application.php, reachable through index.php; and, when Internet Explorer or Konqueror is used, (2) allow remote attackers to inject arbitrary web script or HTML via the searchword parameter in a search action to index.php in the comsearch component. NOTE: vector 2 exists because of an incomplete fix for CVE-2011-2509.5.