CVE-2026-45209: MyCryptoCheckout Auth Bypass Vulnerability

CVE-2026-45209 Overview

CVE-2026-45209 is a missing authorization vulnerability in the MyCryptoCheckout WordPress plugin by edward_plainview. The flaw affects all versions up to and including 2.161. Attackers can exploit incorrectly configured access control security levels to interact with plugin functionality that should require authentication or elevated privileges. The vulnerability is network-exploitable without user interaction and requires no prior authentication.

Critical Impact
Unauthenticated attackers can access plugin functionality protected by broken access controls, leading to confidentiality impact on affected WordPress installations.

Affected Products

MyCryptoCheckout WordPress plugin versions through 2.161
WordPress installations using the edward_plainview MyCryptoCheckout extension
E-commerce sites accepting cryptocurrency payments via MyCryptoCheckout

Discovery Timeline

2026-05-25 - CVE-2026-45209 published to NVD
2026-05-26 - Last updated in NVD database

Technical Details for CVE-2026-45209

Vulnerability Analysis

The vulnerability is classified under [CWE-862] Missing Authorization. The MyCryptoCheckout plugin exposes functionality without verifying that the requesting user holds the required capabilities or role. WordPress plugins commonly enforce access control through current_user_can() checks, nonce verification, and capability mapping. When these controls are absent or misconfigured, sensitive plugin endpoints become reachable by unauthenticated callers.

The attack vector is network-based with low complexity, and exploitation requires no privileges or user interaction. The impact is limited to confidentiality, suggesting attackers can read data or invoke read-oriented functionality without modifying state. The EPSS score is 0.032%, placing exploitation probability in a low percentile at the time of analysis.

Root Cause

The root cause is improper enforcement of access control on one or more plugin handlers. The plugin fails to validate that the caller possesses the required capability before executing privileged actions. This pattern typically occurs when AJAX actions, REST routes, or admin-post hooks are registered without corresponding permission callbacks or capability checks.

Attack Vector

An attacker sends crafted HTTP requests to the affected plugin endpoint on a vulnerable WordPress site. Because no authentication or authorization gate exists, the server processes the request and returns data the caller should not be able to access. Refer to the Patchstack Vulnerability Report for technical details on the affected handler.

Detection Methods for CVE-2026-45209

Indicators of Compromise

Unauthenticated HTTP requests to MyCryptoCheckout plugin endpoints under /wp-admin/admin-ajax.php or /wp-json/ paths
Anomalous request volume to plugin-specific action parameters from external IP addresses
Access log entries showing successful HTTP 200 responses to plugin endpoints from unauthenticated sessions

Detection Strategies

Inspect WordPress access logs for requests targeting MyCryptoCheckout AJAX actions or REST routes without an authentication cookie
Deploy web application firewall rules that flag access to plugin endpoints from sources lacking a valid wordpress_logged_in_* cookie
Correlate plugin endpoint access against expected administrative IP ranges and user agents

Monitoring Recommendations

Enable WordPress audit logging to capture plugin endpoint invocations and originating user context
Monitor outbound data volume from the WordPress host for indicators of bulk data extraction
Track plugin version inventory across all WordPress instances to identify unpatched MyCryptoCheckout installations

How to Mitigate CVE-2026-45209

Immediate Actions Required

Identify all WordPress sites running MyCryptoCheckout version 2.161 or earlier
Update the MyCryptoCheckout plugin to the patched release once published by the vendor
Restrict access to /wp-admin/admin-ajax.php and plugin REST routes via web application firewall rules until the patch is applied
Review WordPress access logs for prior exploitation attempts against plugin endpoints

Patch Information

The vulnerability affects MyCryptoCheckout from n/a through version 2.161. Site administrators should monitor the Patchstack Vulnerability Report and the vendor's plugin repository for the fixed release and apply it across all affected installations.

Workarounds

Disable the MyCryptoCheckout plugin until a patched version is installed if cryptocurrency payment functionality is not business-critical
Apply WAF rules that block unauthenticated requests to MyCryptoCheckout-specific AJAX action parameters and REST namespaces
Restrict WordPress admin and AJAX endpoints to known administrative IP addresses where operationally feasible

bash

# Example nginx rule to restrict plugin AJAX actions to authenticated sessions
location = /wp-admin/admin-ajax.php {
    if ($arg_action ~* "^mycryptocheckout_") {
        if ($http_cookie !~* "wordpress_logged_in_") {
            return 403;
        }
    }
    include fastcgi_params;
    fastcgi_pass php-fpm;
}