CVE-2026-65445 Overview
CVE-2026-65445 is an unauthenticated broken access control vulnerability affecting the Ad Invalid Click Protector (AICP) WordPress plugin in versions 1.3.0 and earlier. The flaw is classified as a missing authorization weakness [CWE-862], enabling remote attackers to reach functionality that should be restricted to authorized users. Exploitation requires no authentication and no user interaction, and can be performed over the network. Successful abuse can compromise the integrity and availability of the plugin's protected resources.
Critical Impact
Remote unauthenticated attackers can invoke restricted plugin actions in AICP <= 1.3.0, undermining click-fraud protection integrity and availability on affected WordPress sites.
Affected Products
- Ad Invalid Click Protector (AICP) WordPress plugin versions <= 1.3.0
- WordPress installations with the AICP plugin activated
- Sites relying on AICP for invalid click detection and ad fraud mitigation
Discovery Timeline
- 2026-07-27 - CVE-2026-65445 published to NVD
- 2026-07-28 - Last updated in NVD database
Technical Details for CVE-2026-65445
Vulnerability Analysis
The vulnerability stems from missing authorization checks in the Ad Invalid Click Protector plugin. Functions that modify or expose plugin state do not validate whether the requesting user holds the required capability. As a result, requests from unauthenticated sources are processed as if they originated from a permitted user.
The issue maps to CWE-862: Missing Authorization. Broken access control flaws of this type typically arise when plugin endpoints check nonces inconsistently, omit current_user_can() calls, or expose administrative AJAX actions to wp-admin/admin-ajax.php via wp_ajax_nopriv_ hooks. The EPSS score is 0.196% (9.638 percentile), indicating a low near-term exploitation probability at the time of publication.
Root Cause
The root cause is the absence of proper capability and authentication checks on privileged plugin actions. The affected code paths in AICP <= 1.3.0 accept requests without verifying whether the caller has permission to invoke them.
Attack Vector
An attacker sends crafted HTTP requests to exposed plugin endpoints on the target WordPress site. Because no authentication is required, the attack can be launched directly over the network against any reachable installation. Refer to the Patchstack advisory for endpoint-level technical details.
// No verified public exploit code is available.
// The vulnerability is triggered by unauthenticated HTTP requests
// to AICP plugin endpoints that lack capability checks.
Detection Methods for CVE-2026-65445
Indicators of Compromise
- Unexpected modifications to AICP plugin settings or click-tracking data without a corresponding administrator login event.
- Anomalous POST requests to admin-ajax.php referencing AICP action names from unauthenticated sessions.
- Sudden changes in blocked IP lists, thresholds, or click logs maintained by the plugin.
Detection Strategies
- Review web server access logs for requests to AICP-related endpoints originating from unauthenticated clients.
- Correlate WordPress audit logs with plugin configuration changes to detect changes lacking an authenticated user context.
- Deploy a Web Application Firewall (WAF) rule to flag requests targeting AICP action parameters without valid session cookies.
Monitoring Recommendations
- Continuously monitor WordPress plugin inventories to identify AICP installations at or below version 1.3.0.
- Alert on high-volume or repeated access to plugin AJAX endpoints from single source IPs.
- Track integrity of plugin database options and log tables to detect unauthorized writes.
How to Mitigate CVE-2026-65445
Immediate Actions Required
- Identify all WordPress sites running Ad Invalid Click Protector version 1.3.0 or earlier.
- Update the AICP plugin to a fixed version as identified in the Patchstack advisory.
- If no patched version is available, deactivate and remove the plugin until a fix is released.
- Audit plugin configuration and logs for signs of unauthorized modification.
Patch Information
Refer to the vendor and Patchstack advisory for the fixed release. Apply the update through the WordPress plugin manager or via WP-CLI. Verify the installed version after upgrade to confirm remediation.
Workarounds
- Restrict access to wp-admin/admin-ajax.php from untrusted networks using WAF or web server rules where feasible.
- Apply virtual patching via a WAF to block requests invoking AICP actions without an authenticated session.
- Temporarily disable the AICP plugin if it is not business-critical until an official fix is deployed.
# Identify AICP plugin version via WP-CLI
wp plugin get ad-invalid-click-protector --field=version
# Update the plugin to the latest available version
wp plugin update ad-invalid-click-protector
# If no patched version exists, deactivate the plugin
wp plugin deactivate ad-invalid-click-protector
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
