What the vulnerability does
01Description
The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 9.1.0. This is due to missing or incorrect nonce validation on the hook_newsletter_action() function. This makes it possible for unauthenticated attackers to unsubscribe newsletter subscribers via a forged request granted they can trick a logged-in user into performing an action such as clicking on a link.
Explanation of Vulnerability in Simple Terms
02Summary
The Newsletter plugin for WordPress versions up to 9.1.0 contains a cross-site request forgery (CSRF) vulnerability. An attacker can craft a malicious webpage that, when visited by a logged-in site administrator, performs unwanted actions within the plugin without the administrator's knowledge or consent. The vulnerability requires the victim to visit the attacker's page while authenticated to WordPress.
What an attacker can do
03Attacker Capabilities
Perform unwanted actions in the Newsletter plugin on behalf of a logged-in administrator.
Potential impact on your site
04Site Impact
An attacker could modify newsletter settings, subscriber lists, or email content if an admin visits a compromised page.
Conditions required to exploit
05Prerequisites
Administrator must visit a malicious webpage while logged into WordPress.
Key dates
06Disclosure timeline
January 20, 2026
CVE published
April 8, 2026
Record updated
