CVE-2026-12142
Received Received - Intake

Stored XSS in NEX-Forms Ultimate Forms WordPress Plugin

Publication date: 2026-07-01

Last updated on: 2026-07-01

Assigner: Wordfence

Description
The NEX-Forms – Ultimate Forms Plugin for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via '_name[]' Array Parameter in all versions up to, and including, 9.2.2 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 wp_kses() output filtering pass provides no mitigation because NEXForms_allowed_tags() explicitly permits <script>, <iframe src/srcdoc>, and JS event handlers such as onClick, onBlur, and onChange in its allow-list.

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Meta Information

Published
2026-07-01
Last Modified
2026-07-01
Generated
2026-07-01
AI Q&A
2026-07-01
EPSS Evaluated
N/A
NVD
CVE-2026-12142
EUVD
EUVD-2026-40944

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
nex-forms ultimate_forms_plugin to 9.2.2 (inc)
nex_forms nex_forms_ultimate_forms_plugin to 9.2.2 (inc)
nex_forms ultimate_forms_plugin to 9.2.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

The NEX-Forms – Ultimate Forms Plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via the '_name[]' array parameter in all versions up to and including 9.2.2. This vulnerability arises because the plugin does not properly sanitize input or escape output. As a result, unauthenticated attackers can inject arbitrary web scripts into pages, which will execute whenever a user accesses those pages.

The usual output filtering function wp_kses() does not mitigate this issue because the plugin's allowed tags list explicitly permits potentially dangerous elements such as <script>, <iframe src/srcdoc>, and JavaScript event handlers like onClick, onBlur, and onChange.

Impact Analysis

This vulnerability can allow attackers to execute arbitrary JavaScript in the context of the affected website without authentication. This can lead to several impacts including theft of user credentials, session hijacking, defacement of the website, or distribution of malware to visitors.

Because the vulnerability is stored, the malicious script persists on the site and affects every user who visits the infected page, increasing the potential damage.

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