---
id: CVE-2026-96566
title: >-
  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…
summary: >-
  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…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: satollo
product: Newsletter – Send awesome emails from WordPress
affected:
  - newsletter_send_awesome_emails_from_wordpress <= 9.4.0
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T13:18:55.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96566'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/classes.php#L212
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1032
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L1006
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/plugin.php#L457
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/profile/profile.php#L511
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L257
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L723
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3711290%40newsletter&new=3711290%40newsletter
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/6e61119c-b83e-41b4-aa14-7dc61086520d?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-02T08:14:06.218Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.