The file scanning mechanism of JFilterInput::isFileSafe() in Joomla! CMS before 3.6.5 does not consider alternative PHP file extensions when checking uploaded files for PHP content, which enables a user to upload and execute files with the `.php6`, `.php7`, `.phtml`, and `.phpt` extensions. Additionally, JHelperMedia::canUpload() did not blacklist these file extensions as uploadable file types.

The register method in the UsersModelRegistration class in controllers/user.php in the Users component in Joomla! before 3.6.4, when registration has been disabled, allows remote attackers to create user accounts by leveraging failure to check the Allow User Registration configuration setting.

The register method in the UsersModelRegistration class in controllers/user.php in the Users component in Joomla! before 3.6.4 allows remote attackers to gain privileges by leveraging incorrect use of unfiltered data when registering on a site.

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.

SQL injection vulnerability in the EQ Event Calendar component for Joomla! allows remote attackers to execute arbitrary SQL commands via the id parameter to eqfullevent.

Cross-site scripting (XSS) vulnerability in the ja_purity template for Joomla! 1.5.26 and earlier allows remote attackers to inject arbitrary web script or HTML via the Mod* cookie parameter to html/modules.php.

Cross-site scripting (XSS) vulnerability in manage.php in the PBBooking (com_pbbooking) component 2.4 for Joomla! allows remote attackers to inject arbitrary web script or HTML via the an arbitrary parameter in an edit action to administrator/index.php.

Multiple cross-site scripting (XSS) vulnerabilities in tmpl/layout_editevent.php in the Multi Calendar (com_multicalendar) component 4.0.2, and possibly 4.8.5 and earlier, for Joomla! allow remote attackers to inject arbitrary web script or HTML via the (1) calid or (2) paletteDefault parameter in an editevent action to index.php.

Multiple cross-site scripting (XSS) vulnerabilities in the Freichat (com_freichat) component, possibly 9.4 and earlier, for Joomla! allow remote attackers to inject arbitrary web script or HTML via the (1) id or (2) xhash parameter to client/chat.php or (3) toname parameter to client/plugins/upload/upload.php.

Multiple cross-site scripting (XSS) vulnerabilities in the StackIdeas Komento (com_komento) component before 1.7.3 for Joomla! allow remote attackers to inject arbitrary web script or HTML via the (1) website or (2) latitude parameter in a comment to the default URI.

SQL injection vulnerability in the JV Comment (com_jvcomment) component before 3.0.3 for Joomla! allows remote authenticated users to execute arbitrary SQL commands via the id parameter in a comment.like action to index.php.

Cross-site scripting (XSS) vulnerability in the aiContactSafe component before 2.0.21 for Joomla! allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Cross-site scripting (XSS) vulnerability in the aiContactSafe component before 2.0.21 for Joomla! allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Cross-site scripting (XSS) vulnerability in the nBill (com_nbill) component 2.3.2 for Joomla! allows remote attackers to inject arbitrary web script or HTML via the message parameter in an income action to administrator/index.php.

Unspecified vulnerability in the NinjaXplorer component before 1.0.7 for Joomla! has unknown impact and attack vectors.

Joomla! 1.5.x before 1.5.26 does not properly check permissions, which allows attackers to obtain sensitive "administrative back end information" via unknown vectors. NOTE: this might be a duplicate of CVE-2012-1611.

Joomla! 1.5.x before 1.5.26 has unspecified impact and attack vectors related to "insufficient randomness" and a "password reset vulnerability."

Directory traversal vulnerability in Jstore (com_jstore) component for Joomla! allows remote attackers to read arbitrary files and possibly have unspecified other impact via a .. (dot dot) in the controller parameter to index.php.

Directory traversal vulnerability in the Community Builder Enhanced (CBE) (com_cbe) component 1.4.8, 1.4.9, and 1.4.10 for Joomla! allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the tabname parameter in a userProfile action to index.php. NOTE: this can be leveraged to execute arbitrary code by using the file upload feature.

Joomla! before 1.5.12 does not perform a JEXEC check in unspecified files, which allows remote attackers to obtain the installation path via unspecified vectors.