CVE-2025-53309: Contact Form 7 Stripe Plugin Disclosure Flaw

CVE-2025-53309 Overview

CVE-2025-53309 is a sensitive information disclosure vulnerability in the ZealousWeb Accept Stripe Payments Using Contact Form 7 WordPress plugin. The flaw affects all plugin versions up to and including 3.0. It is categorized under [CWE-201]: Insertion of Sensitive Information Into Sent Data. Unauthenticated attackers can retrieve embedded sensitive data over the network without user interaction. The issue was published to the National Vulnerability Database (NVD) on June 27, 2025.

Critical Impact
Remote, unauthenticated attackers can retrieve embedded sensitive data from vulnerable WordPress sites running the Accept Stripe Payments Using Contact Form 7 plugin versions up to 3.0.

Affected Products

ZealousWeb Accept Stripe Payments Using Contact Form 7 plugin for WordPress
All versions from initial release through 3.0
WordPress sites processing Stripe payments through Contact Form 7

Discovery Timeline

2025-06-27 - CVE-2025-53309 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-53309

Vulnerability Analysis

The vulnerability stems from improper handling of sensitive data within the Accept Stripe Payments Using Contact Form 7 plugin. The plugin embeds sensitive information in data sent to unintended recipients or exposes it through accessible response contexts. Attackers can retrieve this data by issuing standard network requests to the vulnerable WordPress instance.

The issue is classified as [CWE-201]: Insertion of Sensitive Information Into Sent Data. This weakness occurs when an application includes confidential data in transmissions that either travel to unauthorized parties or are accessible without proper authorization checks. Exploitation requires no authentication and no user interaction.

The confidentiality impact is limited but non-trivial, since the exposed information may include payment-related metadata, form submission details, or configuration fragments used by the plugin. Integrity and availability are not affected.

Root Cause

The root cause is the plugin's failure to restrict sensitive data from being embedded in outbound content or accessible responses. The plugin does not enforce sufficient access controls on the data it sends or exposes. This allows external actors to observe values that should remain private to the site owner or the payment processor.

Attack Vector

Exploitation occurs over the network against public-facing WordPress sites. An attacker sends crafted or standard requests to endpoints or pages served by the plugin and reads sensitive values from the response. No credentials, session, or victim interaction are required. Refer to the Patchstack Vulnerability Report for technical specifics.

Detection Methods for CVE-2025-53309

Indicators of Compromise

Unauthenticated HTTP GET requests to Contact Form 7 or Stripe integration endpoints from unfamiliar IP addresses
Web server access logs showing repeated automated scraping of pages containing the plugin's shortcodes
Unusual referrer patterns or user-agent strings targeting wp-content/plugins/accept-stripe-payments-using-contact-form-7/ paths

Detection Strategies

Inventory WordPress installations and identify sites running the accept-stripe-payments-using-contact-form-7 plugin at version 3.0 or earlier
Review HTML responses and JavaScript bundles served by affected pages for embedded sensitive values such as API identifiers or configuration data
Correlate outbound data flows against expected recipients using web application firewall (WAF) logs

Monitoring Recommendations

Enable verbose logging on WordPress and the hosting web server to capture all requests to plugin endpoints
Monitor for anomalous access patterns targeting Contact Form 7 pages that integrate Stripe payments
Ingest web server, WAF, and WordPress audit logs into a centralized analytics platform for correlation and retention

How to Mitigate CVE-2025-53309

Immediate Actions Required

Identify all WordPress sites running the Accept Stripe Payments Using Contact Form 7 plugin at version 3.0 or lower
Update the plugin to a version above 3.0 once the vendor releases a fix, or disable and remove the plugin if no patch is available
Rotate any Stripe API keys or credentials that may have been exposed through the plugin
Review recent form submissions and payment logs for signs of unauthorized reconnaissance

Patch Information

The advisory indicates the vulnerability affects the plugin from initial release through version 3.0. Site administrators should consult the Patchstack Vulnerability Report and the WordPress plugin repository for the latest fixed release. Apply the update through the WordPress admin dashboard or via wp-cli.

Workarounds

Temporarily deactivate the plugin until a patched version is installed
Restrict access to pages using the plugin through IP allowlisting or authentication where feasible
Deploy a WAF rule to block anomalous requests to plugin endpoints and inspect responses for sensitive data patterns

bash

# Configuration example: update the plugin using wp-cli
wp plugin update accept-stripe-payments-using-contact-form-7

# Or deactivate the plugin as a temporary workaround
wp plugin deactivate accept-stripe-payments-using-contact-form-7