CVE-2025-31629: Infusionsoft Web Form JavaScript XSS Flaw

CVE-2025-31629 Overview

CVE-2025-31629 is a stored cross-site scripting (XSS) vulnerability in the Jacob Allred Infusionsoft Web Form JavaScript plugin for WordPress. The flaw affects all plugin versions up to and including 1.1.1. Attackers with low-privileged authenticated access can inject malicious JavaScript that persists in the application and executes in the browsers of users who view the affected pages.

The vulnerability is classified under [CWE-79]: Improper Neutralization of Input During Web Page Generation. Exploitation requires user interaction and can cross security scopes, meaning injected scripts may affect components beyond the initial vulnerable context.

Critical Impact

Stored XSS enables attackers to hijack sessions, redirect users, deface pages, or perform actions on behalf of site administrators visiting compromised WordPress pages.

Affected Products

• Jacob Allred Infusionsoft Web Form JavaScript plugin for WordPress
• All versions from initial release through 1.1.1
• WordPress sites running the vulnerable plugin

Discovery Timeline

• 2025-03-31 - CVE-2025-31629 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31629

Vulnerability Analysis

The Infusionsoft Web Form JavaScript plugin fails to properly sanitize user-supplied input before rendering it in web page output. An authenticated user with low privileges can submit crafted input containing JavaScript payloads through plugin fields that accept form configuration data.

Because the payload is stored server-side, every subsequent visitor who loads the affected page triggers execution of the attacker-controlled script. The scope change indicated in the CVSS vector means the injected code can affect resources beyond the vulnerable component itself, including the WordPress admin interface.

Additional details are available in the Patchstack XSS Vulnerability Report.

Root Cause

The plugin does not apply appropriate output encoding or input sanitization on parameters used to generate JavaScript-bearing HTML. WordPress provides helpers such as esc_html(), esc_attr(), and wp_kses() for this purpose, but the vulnerable code paths do not consistently invoke them before echoing user-controlled values.

Attack Vector

Exploitation occurs over the network and requires an authenticated account with at least contributor-level privileges. An attacker submits a malicious payload through a plugin input field. When an administrator or another user loads a page rendering that field, the browser executes the payload in the site's origin, enabling session theft, forced administrative actions, or drive-by malware delivery.

See the Patchstack advisory for technical details on the affected parameters.

Detection Methods for CVE-2025-31629

Indicators of Compromise

• Unexpected <script> tags, on* event handlers, or javascript: URIs stored in WordPress post content, options, or plugin-specific tables
• Outbound HTTP requests from administrator browsers to unfamiliar domains shortly after loading pages that render Infusionsoft web forms
• Newly created administrator accounts or modified user roles that correlate with visits to plugin-generated pages

Detection Strategies

• Inventory WordPress installations to identify any using infusionsoft-web-form-javascript at version 1.1.1 or earlier
• Scan the wp_posts, wp_postmeta, and wp_options tables for stored script payloads or encoded JavaScript in plugin-managed fields
• Review web server access logs for POST requests to plugin endpoints containing HTML tags or JavaScript keywords in parameters

Monitoring Recommendations

• Enable Content Security Policy (CSP) reporting to capture inline script violations originating from plugin-rendered pages
• Alert on WordPress user role changes, plugin installations, and administrative configuration edits
• Correlate authenticated contributor or author submissions with subsequent administrator page views to identify potential exploitation chains

How to Mitigate CVE-2025-31629

Immediate Actions Required

• Deactivate the Infusionsoft Web Form JavaScript plugin on any WordPress site running version 1.1.1 or earlier until a patched release is verified
• Audit stored plugin data and remove any embedded script payloads found in the database
• Rotate credentials and session tokens for administrator accounts that may have loaded compromised pages

Patch Information

No fixed version is listed in the NVD entry at the time of publication. Monitor the Patchstack advisory and the plugin's WordPress.org page for release updates. Apply any vendor-supplied patch as soon as it becomes available.

Workarounds

• Restrict contributor, author, and editor account creation to trusted users while the plugin remains unpatched
• Deploy a web application firewall (WAF) rule to block requests containing script tags or JavaScript event handlers directed at plugin endpoints
• Enforce a strict Content Security Policy that disallows inline scripts to limit the impact of stored XSS payloads

# Example CSP header enforcing no inline scripts
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'"