CVE-2025-9635: WordPress Analytics Plugin CSRF Vulnerability

CVE-2025-9635 Overview

CVE-2025-9635 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Analytics Reduce Bounce Rate plugin for WordPress in all versions up to and including 2.3. The flaw resides in the unbounce_options function, which lacks proper nonce validation. Unauthenticated attackers can modify Google Analytics tracking settings by tricking a site administrator into clicking a crafted link. The vulnerability is tracked under CWE-352 and requires user interaction to succeed.

Critical Impact
Successful exploitation allows attackers to alter Google Analytics tracking configuration on affected WordPress sites, potentially redirecting analytics data or injecting attacker-controlled tracking identifiers.

Affected Products

Analytics Reduce Bounce Rate plugin for WordPress
All versions up to and including 2.3
WordPress sites running the vulnerable analytics-unbounce plugin

Discovery Timeline

2025-09-11 - CVE-2025-9635 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-9635

Vulnerability Analysis

The Analytics Reduce Bounce Rate plugin exposes an administrative settings handler through the unbounce_options function without validating a WordPress nonce token. WordPress nonces are the platform's standard defense against CSRF, binding form submissions to a specific user session. When the plugin processes POST requests to update Google Analytics tracking configuration, it does not verify that the request originated from an authenticated administrative interaction. This omission allows an attacker to craft an HTML form or JavaScript payload that submits arbitrary settings to the plugin's option handler. If an authenticated administrator visits the attacker's page, the browser submits the request using the administrator's session cookies.

Root Cause

The root cause is missing or incorrect nonce validation in the unbounce_options function of analytics-unbounce.php. The plugin fails to call check_admin_referer() or wp_verify_nonce() before processing configuration updates. The vulnerable code paths are documented in the WordPress plugin repository at analytics-unbounce.php line 86 and line 124.

Attack Vector

An attacker hosts a malicious page containing an auto-submitting form targeting the vulnerable WordPress endpoint. The attacker delivers the link through phishing email, social media, or a compromised website. When a logged-in WordPress administrator opens the link, the browser transmits the forged POST request along with valid authentication cookies. The plugin processes the request as legitimate and updates the Google Analytics tracking ID or related options to attacker-controlled values. Refer to the Wordfence Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-9635

Indicators of Compromise

Unexpected changes to the Google Analytics tracking ID configured in the Analytics Reduce Bounce Rate plugin settings.
Analytics data appearing in a third-party Google Analytics account not owned by the site operator.
Administrator browser history showing visits to unfamiliar external pages immediately prior to configuration changes.

Detection Strategies

Audit the wp_options table for modifications to plugin option keys associated with analytics-unbounce.
Monitor web server access logs for POST requests to wp-admin/options-general.php or the plugin's settings handler lacking a valid Referer header from the site itself.
Compare current Google Analytics tracking IDs against a known-good baseline stored outside WordPress.

Monitoring Recommendations

Enable WordPress activity logging plugins to capture administrative option changes with user and IP attribution.
Alert on outbound admin-panel requests initiated with cross-origin Referer headers.
Track plugin version inventory and flag any WordPress instance running Analytics Reduce Bounce Rate 2.3 or earlier.

How to Mitigate CVE-2025-9635

Immediate Actions Required

Deactivate and remove the Analytics Reduce Bounce Rate plugin until a patched version is confirmed available.
Verify current Google Analytics tracking IDs configured on affected sites and restore known-good values if tampered.
Instruct WordPress administrators to log out of admin sessions before browsing untrusted external links.

Patch Information

No vendor-supplied patch is referenced in the CVE record at the time of publication. Administrators should monitor the WordPress plugin directory listing for a release beyond version 2.3 that adds nonce validation to the unbounce_options function.

Workarounds

Restrict WordPress admin panel access to trusted IP ranges through web server or firewall rules.
Deploy a web application firewall rule that enforces same-origin Referer and Origin headers on plugin settings endpoints.
Use a browser session dedicated to WordPress administration and avoid clicking external links from within that session.

bash

# Example: restrict wp-admin to a trusted IP range in nginx
location ^~ /wp-admin/ {
    allow 203.0.113.0/24;
    deny all;
    try_files $uri $uri/ /index.php?$args;
}