CVE-2025-43838: Custom PC Builder Auth Bypass Flaw

CVE-2025-43838 Overview

CVE-2025-43838 is a missing authorization vulnerability in the ChoPlugins.com Custom PC Builder Lite for WooCommerce plugin. The flaw affects all plugin versions up to and including 1.0.1. Attackers can exploit incorrectly configured access control security levels to change plugin settings without proper authorization. The vulnerability is network-exploitable, requires no authentication, and needs no user interaction. It maps to [CWE-862] (Missing Authorization) and impacts WordPress sites running WooCommerce with this plugin installed.

Critical Impact
Unauthenticated attackers can modify plugin settings on affected WordPress sites running Custom PC Builder Lite for WooCommerce versions up to 1.0.1.

Affected Products

ChoPlugins.com Custom PC Builder Lite for WooCommerce
Versions from n/a through 1.0.1
WordPress installations using the custom-pc-builder-lite-for-woocommerce plugin

Discovery Timeline

2025-05-19 - CVE-2025-43838 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-43838

Vulnerability Analysis

The Custom PC Builder Lite for WooCommerce plugin exposes settings-modification functionality without enforcing proper authorization checks. An unauthenticated remote attacker can send crafted HTTP requests to plugin endpoints and alter configuration values. The issue falls under [CWE-862] Missing Authorization, indicating that the plugin fails to verify user permissions before executing privileged actions. Because the attack executes over the network with low complexity, adversaries can automate exploitation against WordPress sites at scale. The EPSS probability is 0.243%, placing the CVE in the 15.592 percentile for likelihood of exploitation activity.

Root Cause

The plugin's settings handler does not perform capability checks such as current_user_can() or nonce validation before processing state-changing requests. Any HTTP client can reach the affected endpoints and submit configuration updates. This omission bypasses the standard WordPress authorization model that requires administrative privileges for settings changes.

Attack Vector

An attacker sends an unauthenticated HTTP request directly to the vulnerable plugin endpoint. The request contains modified settings parameters that the plugin accepts and persists. No credentials, session tokens, or user interaction are required. See the Patchstack WordPress Vulnerability advisory for reference details.

No verified public proof-of-concept code is available at the time of publication. The vulnerability mechanism relies on direct invocation of unprotected settings handlers rather than a complex exploit chain.

Detection Methods for CVE-2025-43838

Indicators of Compromise

Unexpected changes to Custom PC Builder Lite plugin settings in the WordPress database, particularly in wp_options rows tied to the plugin
HTTP POST requests to plugin admin-ajax or REST endpoints originating from unauthenticated sessions
WordPress audit log entries showing configuration changes with no corresponding administrator login

Detection Strategies

Monitor web server access logs for requests targeting custom-pc-builder-lite-for-woocommerce endpoints from external IPs without prior authentication cookies
Deploy WordPress activity logging plugins to record settings modifications and correlate them with authenticated user sessions
Alert on any HTTP 200 responses to plugin settings endpoints where the request lacks a valid WordPress nonce

Monitoring Recommendations

Track file integrity of plugin configuration values and database options related to the plugin
Review web application firewall (WAF) logs for anomalous POST traffic to WooCommerce plugin paths
Correlate plugin setting changes with WordPress user session telemetry to identify unauthorized modifications

How to Mitigate CVE-2025-43838

Immediate Actions Required

Identify all WordPress sites running Custom PC Builder Lite for WooCommerce and confirm the installed version
Disable or uninstall the plugin on sites running version 1.0.1 or earlier until a patched release is verified
Restore plugin settings to known-good values if unauthorized modifications are detected

Patch Information

No fixed version is listed in the NVD entry at the time of publication. Site administrators should monitor the Patchstack advisory and the vendor's plugin page for a security update beyond version 1.0.1.

Workarounds

Remove or deactivate the plugin until a vendor patch is available
Restrict access to WordPress admin-ajax and REST API endpoints using a web application firewall rule targeting the plugin's paths
Enforce IP allowlisting on /wp-admin/ and plugin-specific endpoints for administrative operations

bash

# Example WAF rule concept to block unauthenticated access to the plugin endpoints
# Adjust to your WAF syntax (ModSecurity, Cloudflare, AWS WAF, etc.)
SecRule REQUEST_URI "@contains custom-pc-builder-lite-for-woocommerce" \
  "id:1004383,phase:1,deny,status:403,\
   msg:'Block unauthenticated access to Custom PC Builder Lite endpoints (CVE-2025-43838)',\
   chain"
  SecRule &REQUEST_COOKIES:wordpress_logged_in "@eq 0"