NEX-Forms - Ultimate Form Builder <= 8.4.3 - Authenticated Stored Cross-Site Scripting via Form Name

4.8
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2023-0439
CVSS 4.8 (Medium)
Publicly Published June 26, 2023
Last Updated June 30, 2023
Researchers Felipe Restrepo Rodriguez (pfelilpe) - Pfelilpe
Edison Poveda

Description

The NEX-Forms - Ultimate Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via form names parameter in versions up to, and including, 8.4.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with administrator-level access to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The plugin has the option to allow lower-level users access to the form, which may make this issue exploitable by lower-privileged users in some instances.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

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Vulnerability Details for NEX-Forms – Ultimate Forms Plugin for WordPress

Software Type Plugin
Software Slug nex-forms-express-wp-form-builder (view on wordpress.org)
Patched? Yes
Remediation Update to version 8.4.4, or a newer patched version
Affected Version
  • <= 8.4.3
Patched Version
  • 8.4.4

Recent vulnerabilities in NEX-Forms – Ultimate Forms Plugin for WordPress

# Title CVE ID CVSS Researchers Date
1 NEX-Forms <= 9.2.2 - Missing Authorization to Unauthenticated Arbitrary Form Entry Modification via nf_send_nf_email AJAX Action CVE-2026-9017 5.3 Michael Iden (Mickhat) July 10, 2026
2 NEX-Forms – Ultimate Forms Plugin for WordPress <= 9.2.2 - Unauthenticated Stored Cross-Site Scripting CVE-2026-57668 7.2 Nguyen Ba Khanh July 10, 2026
3 NEX-Forms <= 9.2.2 - Unauthenticated Stored Cross-Site Scripting via 'real_val__' Parameter CVE-2026-13040 7.2 Taichi Kashimura July 2, 2026
4 NEX-Forms <= 9.2.2 - Unauthenticated Stored Cross-Site Scripting via '_name[]' Array Parameter CVE-2026-12142 7.2 Anthony Cihan (Hann1bl3L3ct3r) June 30, 2026
5 NEX-Forms <= 9.2.2 - Missing Authorization to Unauthenticated Sensitive Information Disclosure via CSVExport Class CVE-2026-12404 5.3 valent1 June 26, 2026
6 NEX-Forms – Ultimate Forms Plugin for WordPress <= 9.1.12 - Authenticated (Administrator+) SQL Injection via 'table' Parameter CVE-2026-7046 4.9 Athul Jayaram May 14, 2026
7 NEX-Forms <= 9.1.11 - Unauthenticated Stored Cross-Site Scripting via POST Parameter Key Names CVE-2026-5063 7.2 Naoya Takahashi (nakko) May 2, 2026
8 NEX-Forms – Ultimate Forms Plugin for WordPress <= 9.1.9 - Missing Authorization to Unauthenticated Arbitrary Form Entry Modification via nf_set_entry_update_id CVE-2026-1947 7.5 Youssef Elouaer March 14, 2026
9 NEX-Forms – Ultimate Forms Plugin for WordPress <= 9.1.9 - Missing Authorization to Authenticated (Subscriber+) License Deactivation via deactivate_license CVE-2026-1948 4.3 Legion Hunter March 13, 2026
10 NEX-Forms <= 9.1.7 - Reflected Cross-Site Scripting CVE-2025-69326 6.1 Skalucy February 9, 2026

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