EUVD-2026-40944
GHSA-j235-ccfg-wwpf
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Unauthenticated network injection with low complexity (AV:N/AC:L/PR:N); scope change (S:C) since script runs in a victim's browser, with low confidentiality/integrity impact and no availability effect.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Stored cross-site scripting in the NEX-Forms - Ultimate Forms Plugin for WordPress (all versions through 9.2.2) lets unauthenticated attackers persist arbitrary JavaScript via the '_name[]' array parameter, which then runs in the browser of any user who views the injected page. The flaw is notable because the plugin's own wp_kses() allow-list (NEXForms_allowed_tags()) deliberately whitelists <script>, <iframe src/srcdoc>, and JS event handlers, so the normal output-filtering layer provides no protection. No public exploit identified at time of analysis; the issue was reported by Wordfence and carries a CVSS 7.2 with a changed scope.
Technical ContextAI
The affected component is a commercial WordPress form-builder plugin (vendor 'webaways', slug nex-forms-express-wp-form-builder), per CPE cpe:2.3:a:webaways:nex-forms_-_ultimate_forms_plugin_for_wordpress. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation): the '_name[]' array parameter is stored without sufficient sanitization and rendered without adequate output escaping. Uniquely, the code path does invoke wp_kses() for filtering, but the custom allow-list function NEXForms_allowed_tags() explicitly permits dangerous elements (<script>, <iframe> with src/srcdoc) and inline event handlers (onClick, onBlur, onChange), effectively neutering the sanitizer. The referenced trac source lines (main.php ~L2660-2903, class.db.php, class.functions.php) trace the storage and rendering flow across plugin versions 9.1.10 and 9.2.2.
RemediationAI
Vendor-released patch: 9.2.3 - upgrade the NEX-Forms plugin to version 9.2.3 or later, which the plugins.trac changeset (old_path tags/9.2.2, new_path tags/9.2.3) identifies as the remediated release. Consult the Wordfence advisory (https://www.wordfence.com/threat-intel/vulnerabilities/id/da235dea-4884-4e6a-a8b8-65d34f050684?source=cve) for details. If immediate patching is not possible, restrict or disable public/unauthenticated access to NEX-Forms forms that accept the '_name[]' field, place a WAF rule in front of the form-submission endpoint to block <script>, <iframe>, and on* event-handler payloads in that parameter, and audit already-stored submissions/pages for injected markup before an administrator views them - note that WAF filtering can produce false positives on legitimate form input and does not remediate previously stored payloads. Deactivating the plugin until patched fully eliminates exposure at the cost of losing form functionality.
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External POC / Exploit Code
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