Auth bypass in Wpdevteam Notificationx – Fomo, Live Sales Notification, Woocommerce Popup, Gdpr, Social Proof, Announcement Banner & Floating Notification Bar

CVE-2026-110721

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.

Vulnerability class: Broken Access Control

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-110721?
CVE-2026-110721 is a medium-severity vulnerability in Wpdevteam Notificationx – Fomo, Live Sales Notification, Woocommerce Popup, Gdpr, Social Proof, Announcement Banner & Floating Notification Bar, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-10-16.
How severe is CVE-2026-110721?
Medium severity. CVSS v3 base score is 5.3 out of 10.