Vulnerability in Newsletter – Send awesome emails from WordPress — CVE-2026-96566

What to do now

Update Newsletter – Send awesome emails from WordPress to 9.4.1 or later.

Affected versions

• Everything up to and including 9.4.0

The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'np1' Custom Field Parameter in all versions up to, and including, 9.4.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The subscription endpoint (na=sa) requires no nonce, no capability check, and no CAPTCHA, and the payload can be smuggled past email-address validation by embedding the {profile_1} placeholder in the local part of the submitted address, since WordPress's is_email() permits curly braces there.

This description is reproduced verbatim from the public vulnerability record.

• https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/classes.php#L212
• https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1032
• https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L1006
• https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/plugin.php#L457
• https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/profile/profile.php#L511
• https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L257

This page is compiled automatically from public databases. Accuracy is not guaranteed; confirm against the vendor advisory before acting.