CVE-2025-10309 Overview
CVE-2025-10309 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the PayPal Forms plugin for WordPress in all versions up to and including 1.0.3. The flaw stems from missing nonce validation in the plugin's form creation and management functions. Unauthenticated attackers can craft malicious requests that create new PayPal forms or modify PayPal payment settings when a site administrator is tricked into clicking a link. The vulnerability is tracked under CWE-352: Cross-Site Request Forgery and requires user interaction to succeed.
Critical Impact
Attackers can manipulate PayPal payment configurations on affected WordPress sites, potentially redirecting payments or altering form behavior without administrator consent.
Affected Products
- PayPal Forms plugin for WordPress versions 1.0.3 and earlier
- WordPress sites with the PayPal Forms plugin installed and active
- Administrator sessions on affected WordPress installations
Discovery Timeline
- 2025-10-03 - CVE-2025-10309 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-10309
Vulnerability Analysis
The PayPal Forms plugin exposes administrative functions that create and manage PayPal forms without verifying the origin of incoming requests. WordPress provides a nonce mechanism specifically for validating that state-changing requests originate from legitimate user actions within the admin interface. The plugin fails to implement wp_verify_nonce() or check_admin_referer() checks on its form creation and payment settings handlers.
An attacker exploits this weakness by hosting a malicious page containing a crafted form or JavaScript payload. When a logged-in WordPress administrator visits this page, the browser automatically sends the administrator's session cookies with the forged request. The plugin processes the request as if it were legitimate administrative input.
The impact is limited to integrity of the plugin's configuration data. Attackers cannot directly read data or crash the site, but they can alter PayPal payment destinations and form structures used by site visitors.
Root Cause
The root cause is missing nonce validation on privileged endpoints handling form creation and PayPal payment settings. The vulnerable code path referenced at line 533 of paypal-forms.php accepts POST parameters without confirming that the request carries a valid WordPress nonce token tied to the administrator's session.
Attack Vector
Exploitation requires the attacker to trick an authenticated administrator into loading attacker-controlled content. Common delivery methods include phishing emails linking to a malicious page, comment spam containing embedded resources, or compromised third-party sites loaded in the same browser session as the WordPress admin dashboard. The forged request submits form data to the vulnerable plugin endpoint, which processes the change silently.
The vulnerability manifests when the plugin's administrative handler processes state-changing POST requests without verifying a nonce token. See the WordPress PayPal Forms Code and the Wordfence Vulnerability Analysis for technical details.
Detection Methods for CVE-2025-10309
Indicators of Compromise
- Unexpected new PayPal forms appearing in the WordPress admin interface
- Modified PayPal payment receiver email or merchant ID in plugin settings
- Administrator activity logs showing form creation or setting changes from unusual referrers
- HTTP POST requests to plugin endpoints lacking a valid _wpnonce parameter
Detection Strategies
- Review WordPress audit logs for PayPal Forms configuration changes correlated with administrator browsing sessions
- Inspect web server access logs for POST requests to paypal-forms.php handlers with external Referer headers
- Monitor for administrator sessions that trigger plugin state changes shortly after visiting external links
Monitoring Recommendations
- Enable a WordPress activity logging plugin to record all changes to PayPal Forms settings
- Alert on modifications to payment-related plugin options in the wp_options table
- Track administrator authentication events alongside plugin configuration changes to identify suspicious sequences
How to Mitigate CVE-2025-10309
Immediate Actions Required
- Update the PayPal Forms plugin to a version above 1.0.3 once the vendor releases a patched release
- Audit existing PayPal Forms configurations and confirm the payment receiver settings have not been altered
- Instruct administrators to log out of WordPress before browsing untrusted sites
Patch Information
No fixed version is listed in the NVD entry as of the last modification date. Site owners should monitor the Wordfence Vulnerability Analysis and the plugin's WordPress.org page for an official update that adds nonce validation to the affected handlers.
Workarounds
- Deactivate and remove the PayPal Forms plugin until a patched version is available
- Deploy a web application firewall rule that blocks POST requests to PayPal Forms endpoints lacking a valid _wpnonce parameter
- Restrict WordPress administrator accounts to dedicated browser profiles that do not visit untrusted content
- Enforce shorter administrator session lifetimes to reduce the exposure window for CSRF attacks
# Example: disable the plugin via WP-CLI until a patch is available
wp plugin deactivate paypal-forms
wp plugin delete paypal-forms
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
