In Joomla! before 3.9.14, the lack of validation of configuration parameters used in SQL queries caused various SQL injection vectors.

An issue was discovered in Joomla! before 3.9.13. A missing access check in the phputf8 mapping files could lead to a path disclosure.

An issue was discovered in Joomla! before 3.9.13. A missing token check in com_template causes a CSRF vulnerability.

In Joomla! 3.x before 3.9.12, inadequate escaping allowed XSS attacks using the logo parameter of the default templates.

In Joomla! before 3.9.11, inadequate checks in com_contact could allow mail submission in disabled forms.

In Joomla! 3.9.7 and 3.9.8, inadequate filtering allows users authorised to create custom fields to manipulate the filtering options and inject an unvalidated option. In other words, the filter attribute in subform fields allows remote code execution. This is fixed in 3.9.9.

An issue was discovered in Joomla! before 3.9.7. The CSV export of com_actionslogs is vulnerable to CSV injection.

An issue was discovered in Joomla! before 3.9.7. The subform fieldtype does not sufficiently filter or validate input of subfields. This leads to XSS attack vectors.

An issue was discovered in Joomla! before 3.9.7. The update server URL of com_joomlaupdate can be manipulated by non Super-Admin users.

An issue was discovered in Joomla! before 3.9.6. The debug views of com_users do not properly escape user supplied data, which leads to a potential XSS attack vector.