CVE-2025-3953: WP Statistics Auth Bypass Vulnerability

CVE-2025-3953 Overview

CVE-2025-3953 affects the WP Statistics plugin for WordPress, a widely deployed privacy-friendly analytics component. The vulnerability stems from a missing capability check on the optionUpdater function in all versions up to and including 14.13.3. Authenticated users with Subscriber-level access or above can modify arbitrary plugin settings without authorization. This weakness is classified under [CWE-862] Missing Authorization. Any WordPress site that permits open user registration and runs a vulnerable version of the plugin is exposed to configuration tampering by low-privileged accounts.

Critical Impact
Authenticated Subscriber-level attackers can update arbitrary WP Statistics plugin settings, enabling unauthorized modification of analytics configuration on affected WordPress sites.

Affected Products

WP Statistics WordPress plugin versions up to and including 14.13.3
WordPress sites permitting user registration (Subscriber role or higher)
Any deployment of the AjaxOptionUpdater.php handler prior to changeset 3283791

Discovery Timeline

2025-04-30 - CVE-2025-3953 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-3953

Vulnerability Analysis

The flaw resides in the optionUpdater AJAX handler exposed by WP Statistics. The handler is registered as an authenticated AJAX endpoint but does not verify that the calling user possesses the administrative capability required to modify plugin options. As a result, any authenticated WordPress user, including default Subscriber accounts, can invoke the endpoint and change plugin settings.

Because WordPress installations frequently allow open registration for comments, memberships, or e-commerce, the bar to reach Subscriber access is low. Attackers who obtain such an account can alter WP Statistics configuration values, potentially disabling telemetry, changing exclusion lists, or modifying settings that support secondary attacks against site administrators. Confidentiality and integrity of plugin configuration are impacted, while availability is unaffected.

Root Cause

The root cause is a missing authorization check inside AjaxOptionUpdater.php. The handler validates authentication but omits a current_user_can() capability check for manage_options or a plugin-specific capability. See the pre-patch source at WordPress Plugin Ajax Option Code.

Attack Vector

Exploitation requires network access to the WordPress admin AJAX endpoint (admin-ajax.php) and a valid authenticated session at Subscriber level or higher. The attacker sends a crafted POST request invoking the optionUpdater action with attacker-controlled option name and value fields. No user interaction from an administrator is required. Technical details of the vulnerable handler and the fix are documented in the Wordfence Vulnerability Report.

Detection Methods for CVE-2025-3953

Indicators of Compromise

POST requests to /wp-admin/admin-ajax.php referencing the optionUpdater action originating from non-administrator user sessions.
Unexpected changes to WP Statistics option rows in the wp_options table, particularly outside scheduled admin activity.
New or recently registered Subscriber accounts issuing AJAX calls to plugin admin endpoints.

Detection Strategies

Review WordPress access logs for authenticated admin-ajax.php requests referencing WP Statistics option-update actions from low-privilege user IDs.
Enable WordPress audit logging plugins to capture option changes and correlate them with the initiating user role.
Compare current plugin settings against a known-good baseline to identify unauthorized modifications.

Monitoring Recommendations

Alert on any modification of wp_options entries prefixed with wp_statistics_ performed by users lacking the manage_options capability.
Monitor spikes in admin-ajax.php traffic tied to Subscriber accounts, which typically should not exercise admin AJAX handlers.
Track newly created accounts that immediately access plugin administrative endpoints.

How to Mitigate CVE-2025-3953

Immediate Actions Required

Update the WP Statistics plugin to version 14.13.4 or later on all WordPress installations.
Audit existing user accounts and remove unused or suspicious Subscriber-level accounts.
Review WP Statistics settings for unauthorized modifications and restore known-good values.

Patch Information

The vendor fixed the issue by adding the missing capability check in the optionUpdater handler. The fix is committed in changeset 3283791 and shipped in WP Statistics version 14.13.4. Site operators should apply the plugin update through the WordPress plugin manager or WP-CLI.

Workarounds

Disable open user registration in WordPress General Settings until the plugin is patched.
Deactivate the WP Statistics plugin temporarily on sites that cannot immediately update.
Restrict access to admin-ajax.php for non-administrative users via a web application firewall rule targeting the optionUpdater action.

bash

# Update WP Statistics via WP-CLI
wp plugin update wp-statistics --version=14.13.4

# Verify installed version
wp plugin get wp-statistics --field=version