Joomla Extension - j2commerce.com - Open redirect in cart controller in J2Store 1.0.0-3.3.20, 4.0.0-4.0.20, 4.1.0-4.1.5 - Four task handlers accepted a base64-encoded URL from user input and redirected to it without validating the destination host, enabling phishing using the shop's trusted domain. No authentication required.
URL Redirection to Untrusted Site The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.