CVE-2025-22730: Ksher Payment Authorization Bypass Flaw

CVE-2025-22730 Overview

CVE-2025-22730 is a Missing Authorization vulnerability [CWE-862] in the Ksher Payment plugin for WordPress, developed by Ksher Thailand. The flaw affects all versions up to and including 1.1.2. Attackers can exploit incorrectly configured access control security levels to reach functionality that should require authentication or elevated privileges. The vulnerability is exploitable over the network without user interaction or prior authentication. Successful exploitation results in limited impacts to integrity and availability, with no direct confidentiality impact.

Critical Impact
Unauthenticated network attackers can invoke restricted plugin functionality in WordPress sites running Ksher Payment <= 1.1.2, enabling unauthorized modifications to payment-related plugin state.

Affected Products

Ksher Payment WordPress plugin (ksher-payment) — all versions through 1.1.2
WordPress sites integrating Ksher Thailand payment processing
E-commerce deployments relying on the affected plugin for checkout flows

Discovery Timeline

2025-02-04 - CVE-2025-22730 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-22730

Vulnerability Analysis

The Ksher Payment plugin exposes one or more actions that lack proper authorization checks. Under the WordPress plugin model, action handlers registered through hooks such as admin_post_*, wp_ajax_*, or wp_ajax_nopriv_* must verify both authentication and capability before executing sensitive logic. In this plugin, that verification is absent or misconfigured, allowing unauthenticated callers to reach code paths intended for privileged users.

The issue maps to CWE-862: Missing Authorization. Callers do not need valid credentials, session tokens, or nonces to invoke the affected endpoints. Because the attack traverses standard HTTP requests to WordPress entry points, no local access or user interaction is required.

The scope of exploitable functionality is limited to what the vulnerable handler exposes. Integrity and availability impacts are constrained, and there is no direct disclosure of sensitive data through this specific flaw. The EPSS score at time of writing is 0.322%.

Root Cause

The root cause is the absence of a current_user_can() capability check and/or nonce verification via check_admin_referer() or wp_verify_nonce() on plugin action handlers. Without these gates, the plugin trusts request parameters without confirming the caller's identity or role.

Attack Vector

An attacker sends crafted HTTP requests to the WordPress site targeting the vulnerable plugin endpoint. Because the endpoint is registered under a nopriv variant or lacks capability checks, the request executes without a valid session. No phishing, browser interaction, or credential theft is required.

No verified public proof-of-concept code is available. Technical details are documented in the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-22730

Indicators of Compromise

Unexpected POST requests to /wp-admin/admin-ajax.php or /wp-admin/admin-post.php referencing Ksher plugin action names from unauthenticated sessions
Requests to plugin endpoints under /wp-content/plugins/ksher-payment/ originating from external IPs without prior authentication cookies
Modifications to plugin option rows in the wp_options table without a corresponding administrator login event

Detection Strategies

Inspect WordPress access logs for repeated calls to plugin action handlers lacking an authenticated wordpress_logged_in_* cookie
Enable a Web Application Firewall (WAF) rule set that flags anonymous invocations of wp_ajax_nopriv_* handlers tied to the Ksher plugin
Correlate plugin configuration changes with the presence of a valid administrator session in the same time window

Monitoring Recommendations

Alert on any request to Ksher Payment action endpoints where the client is not authenticated as a WordPress user with the required capability
Track HTTP response codes and payload sizes for plugin endpoints to detect anomalous automated probing
Monitor for new plugin installations, activations, or downgrades to versions <= 1.1.2

How to Mitigate CVE-2025-22730

Immediate Actions Required

Identify all WordPress sites running the ksher-payment plugin and verify the installed version
Deactivate the plugin on any site running version 1.1.2 or earlier until a patched release is applied
Restrict access to /wp-admin/admin-ajax.php and /wp-admin/admin-post.php from untrusted networks where feasible

Patch Information

At the time of publication, no fixed version is identified in the referenced advisory beyond confirmation that versions through 1.1.2 are affected. Administrators should consult the Patchstack advisory and the vendor's plugin repository for the latest patched release, then upgrade to a version newer than 1.1.2 as soon as one is available.

Workarounds

Disable and remove the Ksher Payment plugin until a fixed version is published
Deploy a virtual patch through a WordPress-aware WAF such as Patchstack, Wordfence, or Sucuri to block unauthenticated calls to affected endpoints
Restrict administrative endpoints by IP allowlist at the web server or reverse proxy layer
Enforce authentication in front of admin-ajax.php for the specific action values exposed by the plugin

bash

# Example nginx rule to block anonymous calls to Ksher plugin AJAX actions
location = /wp-admin/admin-ajax.php {
    if ($arg_action ~* "^ksher_") {
        if ($http_cookie !~* "wordpress_logged_in_") {
            return 403;
        }
    }
    include fastcgi_params;
    fastcgi_pass php_upstream;
}