Email Subscribers & Newsletters <= 4.2.2 - Cross-Site Request Forgery on Settings

Reaching this weakness in Email Subscribers & Newsletters <= 4.2.2 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.

An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Email Subscribers & Newsletters the fix is 4.2.3: builds <= 4.2.2 are affected, anything from 4.2.3 onward is not.