An issue was discovered in Joomla! through 3.9.19. Lack of input filtering and escaping allows XSS attacks in mod_random_image.

In Joomla! before 3.9.19, the default settings of the global textfilter configuration do not block HTML inputs for Guest users.

In Joomla! before 3.9.19, lack of input validation in the heading tag option of the "Articles - Newsflash" and "Articles - Categories" modules allows XSS.

In Joomla! before 3.9.19, missing token checks in com_postinstall lead to CSRF.

An issue was discovered in Joomla! before 3.9.17. Improper input validations in the usergroup table class could lead to a broken ACL configuration.

An issue was discovered in Joomla! before 3.9.17. Incorrect ACL checks in the access level section of com_users allow the unauthorized deletion of usergroups.

An issue was discovered in Joomla! before 3.9.16. The lack of type casting of a variable in a SQL statement leads to a SQL injection vulnerability in the Featured Articles frontend menutype.

An issue was discovered in Joomla! before 3.9.16. Inadequate handling of CSS selectors in the Protostar and Beez3 JavaScript allows XSS attacks.

An issue was discovered in Joomla! before 3.9.16. Missing token checks in the image actions of com_templates lead to CSRF.

An issue was discovered in Joomla! before 3.9.16. Missing length checks in the user table can lead to the creation of users with duplicate usernames and/or email addresses.

An issue was discovered in Joomla! before 3.9.16. Incorrect Access Control in the SQL fieldtype of com_fields allows access for non-superadmin users.

An issue was discovered in Joomla! before 3.9.16. Various actions in com_templates lack the required ACL checks, leading to various potential attack vectors.

An issue was discovered in Joomla! before 3.9.15. A missing CSRF token check in the LESS compiler of com_templates causes a CSRF vulnerability.

An issue was discovered in Joomla! before 3.9.15. Missing token checks in the batch actions of various components cause CSRF vulnerabilities.

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.

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.