A stored cross-site scripting vulnerability exists in the admin panel of Magento Open Source prior to 1.9.4.2, and Magento Commerce prior to 1.14.4.2, Magento 2.1 prior to 2.1.18, Magento 2.2 prior to 2.2.9, Magento 2.3 prior to 2.3.2. This could be exploited by an authenticated user with privileges to newsletter templates.

A defense-in-depth check was added to mitigate inadequate session validation handling by 3rd party checkout modules. This impacts Magento 1.x prior to 1.9.4.2, Magento Commerce prior to 1.14.4.2, Magento 2.1 prior to 2.1.18, Magento 2.2 prior to 2.2.9 and Magento 2.3 prior to 2.3.2.

An unauthenticated user can execute SQL statements that allow arbitrary read access to the underlying database, which causes sensitive data leakage. This issue is fixed in Magento 2.1 prior to 2.1.18, Magento 2.2 prior to 2.2.9, Magento 2.3 prior to 2.3.2.

Magento Community Edition and Enterprise Edition before 2.0.10 and 2.1.x before 2.1.2 have XSS via e-mail templates that are mishandled during a preview, aka APPSEC-1503.