SQL injection vulnerability in the Kunena Forum (com_kunena) component 1.5.3 and 1.5.4 for Joomla! allows remote attackers to execute arbitrary SQL commands via the func parameter to index.php.

In the Kunena extension 5.0.2 through 5.0.4 for Joomla!, the forum message subject (aka topic subject) accepts JavaScript, leading to XSS. Six files are affected: crypsis/layouts/message/item/default.php, crypsis/layouts/message/item/top/default.php, crypsis/layouts/message/item/bottom/default.php, crypsisb3/layouts/message/item/default.php, crypsisb3/layouts/message/item/top/default.php, and crypsisb3/layouts/message/item/bottom/default.php. This is fixed in 5.0.5.

Multiple cross-site scripting (XSS) vulnerabilities in the Kunena component before 3.0.6 for Joomla! allow remote attackers to inject arbitrary web script or HTML via the (1) index value of an array parameter or the filename parameter in the Content-Disposition header to the (2) file or (3) profile image upload functionality.

Multiple SQL injection vulnerabilities in the Kunena component before 3.0.6 for Joomla! allow remote authenticated users to execute arbitrary SQL commands via the index value in an array parameter, as demonstrated by the topics[] parameter in an unfavorite action to index.php.

SQL injection vulnerability in news.php in the Kunena component 1.7.2 for Joomla! allows remote attackers to execute arbitrary SQL commands via the id parameter.

The Kunena extension before 5.1.14 for Joomla! allows XSS via BBCode.

Kunena before 5.0.4 does not restrict avatar file extensions to gif, jpeg, jpg, and png. This can lead to XSS and remote code execution.