An issue was discovered in Joomla! 2.5.0 through 3.8.8 before 3.8.9. The autoload code checks classnames to be valid, using the "class_exists" function in PHP. In PHP 5.3, this function validates invalid names as valid, which can result in a Local File Inclusion.

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.

The Balbooa Gridbox extension version 2.4.0 and previous versions for Joomla! is vulnerable to cross-site scripting, caused by improper validation of user-supplied input. A remote attacker could exploit this vulnerability via a crafted URL to execute script in a victim's Web browser within the security context of the hosting Web site, once the URL is clicked. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.

router.php in the Harmis Ek rishta (aka ek-rishta) 2.10 component for Joomla! allows SQL Injection via the PATH_INFO to a home/requested_user/Sent%20interest/ URI.

In Joomla! Core before 3.8.8, inadequate filtering of file and folder names leads to various XSS attack vectors in the media manager.

An issue was discovered in Joomla! Core before 3.8.8. Under specific circumstances (a redirect issued with a URI containing a username and password when the Location: header cannot be used), a lack of escaping the user-info component of the URI could result in an XSS vulnerability.

An issue was discovered in Joomla! Core before 3.8.8. Inadequate checks allowed users to see the names of tags that were either unpublished or published with restricted view permission.

An issue was discovered in Joomla! Core before 3.8.8. Inadequate input filtering leads to a multiple XSS vulnerabilities. Additionally, the default filtering settings could potentially allow users of the default Administrator user group to perform a XSS attack.

An issue was discovered in Joomla! Core before 3.8.8. The web install application would autofill password fields after either a form validation error or navigating to a previous install step, and display the plaintext password for the administrator account at the confirmation screen.

An issue was discovered in Joomla! Core before 3.8.8. A long running background process, such as remote checks for core or extension updates, could create a race condition where a session that was expected to be destroyed would be recreated.

An issue was discovered in Joomla! Core before 3.8.8. Inadequate checks allowed users to modify the access levels of user groups with higher permissions.

An issue was discovered in Joomla! Core before 3.8.8. Depending on the server configuration, PHAR files might be handled as executable PHP scripts by the webserver.

An issue was discovered in com_fields in Joomla! Core before 3.8.8. Inadequate filtering allows users authorised to create custom fields to manipulate the filtering options and inject an unvalidated option.

The Convert Forms extension before 2.0.4 for Joomla! is vulnerable to Remote Command Execution using CSV Injection that is mishandled when exporting a Leads file.

The jDownloads extension before 3.2.59 for Joomla! has XSS.

The Joom Sky JS Jobs extension before 1.2.1 for Joomla! has XSS.

CSV Injection (aka Excel Macro Injection or Formula Injection) exists in the export feature in the Acyba AcyMailing extension before 5.9.6 for Joomla! via a value that is mishandled in a CSV export.

CSV Injection (aka Excel Macro Injection or Formula Injection) exists in the export feature in the Acyba AcySMS extension before 3.5.1 for Joomla! via a value that is mishandled in a CSV export.

In Joomla! 3.5.0 through 3.8.5, the lack of type casting of a variable in a SQL statement leads to a SQL injection vulnerability in the User Notes list view.

The htmlImageAddTitleAttribute function in sige.php in the Kubik-Rubik Simple Image Gallery Extended (SIGE) extension 3.2.3 for Joomla! has XSS via a crafted image header, as demonstrated by the Caption-Abstract header object in a JPEG file. This is fixed in 3.3.1.