---
id: CVE-2026-110721
title: >-
  NotificationX <= 3.3.3 - Missing Authorization to Unauthenticated Arbitrary
  Content Injection via 'nx_id' Parameter on /popup-submit REST Route
summary: >-
  The NotificationX plugin for WordPress is vulnerable to Missing Authorization
  leading to arbitrary content injection in versions up to, and including, 3.3.3
  The /notificationx/v1/popup-submit REST route is registered with
  permission_call…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-862
vendor: wpdevteam
product: >-
  NotificationX – FOMO, Live Sales Notification, WooCommerce Sales Popup, GDPR,
  Social Proof, Announcement Banner & Floating Notification Bar
affected:
  - >-
    notificationx_fomo_live_sales_notification_woocommerce_sales_popup_gdpr_social_proof_announcement_banner_floating_notification_bar
    <= 3.3.3
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T04:27:00.768Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110721'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/84b5e044-4522-480a-ad14-8886ed691a86?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/notificationx/tags/3.3.3/includes/Extensions/PopupNotification/PopupNotification.php#L1161
  - url: >-
      https://plugins.trac.wordpress.org/browser/notificationx/tags/3.3.3/includes/Extensions/Extension.php#L668
  - url: >-
      https://plugins.trac.wordpress.org/browser/notificationx/tags/3.3.3/includes/Core/Rest/Popup.php#L58
  - url: >-
      https://plugins.trac.wordpress.org/browser/notificationx/tags/3.3.3/includes/Core/Rest/Popup.php#L186
  - url: >-
      https://plugins.trac.wordpress.org/browser/notificationx/tags/3.3.3/includes/Admin/Entries.php#L93
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3746251/notificationx/trunk/includes/Extensions/PopupNotification/PopupNotification.php
tags:
  - cve.org
ingestedAt: '2026-10-16T04:58:47.493Z'
---

## Overview

The NotificationX plugin for WordPress is vulnerable to Missing Authorization leading to arbitrary content injection in versions up to, and including, 3.3.3 The /notificationx/v1/popup-submit REST route is registered with permission_callback => '__return_true', and the handler at PopupNotification::handle_popup_submission() accepts an attacker-controlled nx_id, loads whichever NotificationX campaign that id points to, and copies that campaign's own source into the new entry without verifying that the campaign is a Popup Notification or Exit Intent Popup (the two sources this form is intended to serve). This makes it possible for unauthenticated attackers to inject forged social-proof entries (name, title, message, email, theme) into any enabled non-popup NotificationX campaign — WP Comments, WooCommerce/EDD/Give sales, reviews, etc.

## Affected

- `notificationx_fomo_live_sales_notification_woocommerce_sales_popup_gdpr_social_proof_announcement_banner_floating_notification_bar <= 3.3.3`

## Remediation

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