CVE-2026-22481: BD Courier Order Ratio Auth Bypass Flaw

CVE-2026-22481 Overview

CVE-2026-22481 is a missing authorization vulnerability in the BD Courier Order Ratio Checker WordPress plugin developed by Rasedul Haque Rumi. The flaw affects all versions up to and including 2.0.1. It is classified under [CWE-862] Missing Authorization, where the plugin fails to verify user permissions before executing privileged actions. An authenticated attacker with low-level privileges can exploit incorrectly configured access control to interact with restricted plugin functionality. The vulnerability is network-exploitable and does not require user interaction.

Critical Impact

Authenticated users with minimal privileges can bypass intended access controls in the BD Courier Order Ratio Checker plugin, leading to limited integrity impact on affected WordPress sites.

Affected Products

• BD Courier Order Ratio Checker plugin for WordPress
• All plugin versions from initial release through 2.0.1
• WordPress sites running the bd-courier-order-ratio-checker plugin

Discovery Timeline

• 2026-01-22 - CVE-2026-22481 published to the National Vulnerability Database
• 2026-04-28 - Last updated in NVD database

Technical Details for CVE-2026-22481

Vulnerability Analysis

The BD Courier Order Ratio Checker plugin exposes one or more functions that lack proper authorization checks. The plugin fails to verify whether the requesting user possesses the necessary capability before processing the request. This results in a broken access control condition where lower-privileged authenticated users can invoke actions intended for administrators or other privileged roles.

The vulnerability is categorized as [CWE-862] Missing Authorization. The plugin relies on incorrectly configured security levels, meaning capability checks such as current_user_can() are either missing or improperly scoped. The EPSS score is 0.039%, indicating a low predicted likelihood of exploitation in the immediate term.

Root Cause

The root cause is the absence of capability or nonce verification on plugin endpoints. WordPress plugins commonly register AJAX handlers via wp_ajax_* hooks or REST routes. When these handlers do not call current_user_can() with an appropriate capability such as manage_options, any authenticated user can trigger the action. The BD Courier Order Ratio Checker plugin contains such handlers up to version 2.0.1.

Attack Vector

An attacker requires a valid authenticated session on the target WordPress site, such as a Subscriber or Contributor account. The attacker sends a crafted HTTP request to the vulnerable plugin endpoint over the network. Because the plugin does not enforce authorization, the request is processed regardless of the user's role. Successful exploitation results in low integrity impact, with no confidentiality or availability impact according to the CVSS vector.

No public proof-of-concept exploit is available at the time of publication. Technical details are referenced in the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-22481

Indicators of Compromise

• Unexpected HTTP POST requests to admin-ajax.php or REST API endpoints registered by the bd-courier-order-ratio-checker plugin originating from low-privileged user sessions
• Plugin configuration or data changes performed by users without administrative roles
• Anomalous activity in WordPress audit logs tied to the plugin's action hooks

Detection Strategies

• Inventory all WordPress instances and identify deployments running BD Courier Order Ratio Checker version 2.0.1 or earlier
• Review web server access logs for repeated requests to plugin-specific AJAX or REST endpoints by non-administrative authenticated users
• Enable WordPress activity logging plugins to capture role-action mismatches

Monitoring Recommendations

• Forward WordPress and web server logs to a centralized SIEM for correlation with user role data
• Alert on plugin-related requests where the authenticated user lacks the expected capability
• Monitor for sudden changes in plugin settings or unexpected outbound courier API calls

How to Mitigate CVE-2026-22481

Immediate Actions Required

• Identify all WordPress sites running the BD Courier Order Ratio Checker plugin at version 2.0.1 or below
• Deactivate the plugin until a patched version is confirmed available from the vendor
• Restrict registration of low-privileged accounts on affected WordPress sites where feasible
• Review user audit logs for any unauthorized actions targeting the plugin

Patch Information

At the time of this writing, the vulnerability affects all versions up to and including 2.0.1. Administrators should consult the Patchstack Vulnerability Report for the latest vendor patch status. Apply any released fixed version immediately upon availability.

Workarounds

• Deactivate and remove the plugin until a patched release is published
• Use a Web Application Firewall (WAF) rule to block requests to vulnerable plugin endpoints from non-administrative users
• Enforce least-privilege principles by auditing and reducing the number of authenticated low-privileged accounts

# Example: disable the plugin via WP-CLI on affected hosts
wp plugin deactivate bd-courier-order-ratio-checker
wp plugin status bd-courier-order-ratio-checker