An issue was discovered in Joomla! before 3.9.3. The phar:// stream wrapper can be used for objection injection attacks because there is no protection mechanism (such as the TYPO3 PHAR stream wrapper) to prevent use of the phar:// handler for non .phar-files.

An issue was discovered in Joomla! before 3.9.3. Inadequate checks at the Global Configuration helpurl settings allowed stored XSS.

An issue was discovered in Joomla! before 3.9.3. Inadequate parameter handling in JavaScript code (core.js writeDynaList) could lead to an XSS attack vector.

An issue was discovered in Joomla! before 3.9.2. Inadequate checks of the Global Configuration helpurl settings allowed stored XSS.

An issue was discovered in Joomla! before 3.9.2. Inadequate escaping in mod_banners leads to a stored XSS vulnerability.

An issue was discovered in Joomla! before 3.9.2. Inadequate escaping in com_contact leads to a stored XSS vulnerability.

An issue was discovered in Joomla! before 3.9.2. Inadequate checks of the Global Configuration Text Filter settings allowed stored XSS.

An issue was discovered in Joomla! before 3.8.13. com_joomlaupdate allows the execution of arbitrary code. The default ACL config enabled the ability of Administrator-level users to access com_joomlaupdate and trigger code execution.

An issue was discovered in Joomla! before 3.8.13. com_installer actions do not have sufficient CSRF hardening in the backend.

An issue was discovered in Joomla! before 3.8.13. If an attacker gets access to the mail account of an user who can approve admin verifications in the registration process, he can activate himself.