CVE-2025-54684: Contact Form 7 Constant Contact XSS Flaw

CVE-2025-54684 Overview

CVE-2025-54684 is a stored cross-site scripting (XSS) vulnerability in the CRM Perks Integration for Contact Form 7 and Constant Contact WordPress plugin. The flaw affects all plugin versions up to and including 1.1.7. Attackers with high-privilege access can inject persistent JavaScript payloads that execute in the browsers of users who view affected pages. The issue is classified under [CWE-79] for improper neutralization of input during web page generation. Because the vulnerability crosses a security scope, injected scripts can affect components beyond the plugin itself.

Critical Impact

Authenticated attackers can store malicious scripts that execute in other users' browser sessions, enabling session theft, administrative action hijacking, and content manipulation on affected WordPress sites.

Affected Products

• CRM Perks Integration for Contact Form 7 and Constant Contact WordPress plugin
• Plugin slug: cf7-constant-contact
• All versions from n/a through 1.1.7

Discovery Timeline

• 2025-08-14 - CVE-2025-54684 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-54684

Vulnerability Analysis

The plugin bridges WordPress Contact Form 7 submissions to the Constant Contact marketing platform. Input fields processed by the plugin are rendered back into WordPress pages without adequate output encoding or sanitization. An authenticated user with elevated privileges can submit payloads containing HTML or JavaScript that persist in the database. When another user loads the affected view, the browser parses and executes the stored script in the context of the WordPress site. The scope change indicated by the CVSS vector reflects that the impact extends beyond the vulnerable plugin to the broader application session. User interaction is required for exploitation, typically when an administrator or editor views a page containing the injected content.

Root Cause

The root cause is missing or incomplete sanitization of user-controllable input before it is written to storage and later rendered in HTML output. The plugin does not consistently apply WordPress escaping functions such as esc_html(), esc_attr(), or wp_kses() on fields prior to display. This allows attacker-controlled markup to be interpreted as executable script by the browser.

Attack Vector

Exploitation requires an authenticated account with high privileges within the WordPress instance and requires a second user to interact with the rendered content. The attacker submits crafted input through plugin-managed fields. The payload is stored server-side and served to subsequent viewers as part of standard page rendering. The vulnerability is exploitable over the network with low attack complexity.

No public proof-of-concept code is available for this vulnerability. Refer to the Patchstack Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-54684

Indicators of Compromise

• Unexpected <script>, <iframe>, or event-handler attributes (for example onerror, onload) stored within WordPress database tables tied to plugin form data.
• New or modified administrative accounts created shortly after form submissions from privileged users.
• Outbound HTTP requests from browser sessions of WordPress administrators to unfamiliar external domains.

Detection Strategies

• Review WordPress wp_posts, wp_postmeta, and plugin-specific tables for HTML tags or JavaScript syntax in fields that should contain plain text.
• Inspect web server access logs for POST requests to plugin endpoints containing URL-encoded script fragments such as %3Cscript%3E or javascript:.
• Correlate authenticated form submissions with subsequent anomalous administrative activity from the same or different session.

Monitoring Recommendations

• Enable Content Security Policy (CSP) headers in report-only mode to surface unauthorized inline script execution on WordPress pages.
• Monitor plugin version inventory across WordPress deployments and alert when cf7-constant-contact version is at or below 1.1.7.
• Log and review changes to high-privilege user accounts, roles, and capabilities in real time.

How to Mitigate CVE-2025-54684

Immediate Actions Required

• Identify all WordPress installations running the Integration for Contact Form 7 and Constant Contact plugin at version 1.1.7 or earlier.
• Restrict high-privilege access to trusted personnel and enforce multi-factor authentication on administrator and editor accounts.
• Audit existing plugin-managed content for stored script payloads and remove any suspicious entries.

Patch Information

At the time of NVD publication, no fixed version was listed for versions through 1.1.7. Consult the Patchstack Vulnerability Report and the CRM Perks plugin page for updated patch availability.

Workarounds

• Deactivate and remove the cf7-constant-contact plugin until a patched release is confirmed.
• Deploy a web application firewall (WAF) rule to block requests containing script tags or JavaScript event handlers targeted at plugin endpoints.
• Apply a strict Content Security Policy that disallows inline scripts to limit the impact of stored XSS payloads.

# Example CSP header to restrict inline script execution
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'"