Description

Unauthenticated Settings Change in PayPlug for WooCommerce (Official) <= 3.1.0 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-10-06T09:17:55.480Z",
  "pubdate": "2026-10-06T09:17:55.480Z",
  "executiveSummary": "The PayPlug for WooCommerce (Official) plugin, in versions 3.1.0 and below, contains a critical security vulnerability allowing unauthenticated attackers to modify plugin settings.\nThis flaw is categorized as an improper access control vulnerability, which permits unauthorized configuration changes without the need for administrative privileges.\nThe vulnerability poses a severe risk to the integrity of the payment processing workflow, as an attacker could redirect transaction endpoints, alter API credentials, or disable security validation mechanisms.\nSuccessful exploitation requires no prior authentication, enabling remote attackers to manipulate the plugin's operational parameters directly through exposed administrative hooks.\nThe impact includes potential financial fraud, sensitive payment data interception, or total service disruption by misconfiguring the payment gateway integration.\nOrganizations using affected versions are at significant risk of unauthorized gateway re-configuration, potentially leading to man-in-the-middle attacks or full loss of transaction control.",
  "technicalDetails": "The vulnerability resides within the configuration handling mechanism of the PayPlug for WooCommerce plugin. The core issue stems from the absence of robust capability checks or nonce verification within the settings update functions, specifically during the handling of HTTP POST requests intended for plugin configuration persistence.\nIn versions 3.1.0 and below, the plugin fails to implement adequate authorization logic for sensitive administrative actions. An attacker can craft a malicious HTTP request targeting the specific backend endpoints responsible for updating plugin settings. Because the plugin does not enforce a proper security context for these requests, the application processes the input as legitimate administrative updates.\nThe exploitation flow typically begins with an attacker identifying the endpoint used by the plugin to save configuration data. By bypassing standard authentication filters, the attacker submits arbitrary parameters, such as 'payplug_api_key' or 'payplug_sandbox_mode', directly to the database. This is facilitated by the plugin's reliance on client-side controls or insufficient server-side validation of the 'current_user_can' WordPress capability functions.\nOnce the attacker successfully submits the crafted payload, the plugin overwrites existing configurations with malicious or diverted values. For instance, an attacker could change the payment gateway's API credentials to an attacker-controlled account, or modify callback URLs to intercept transaction status updates. The lack of strict nonce validation means that even if CSRF protections are theoretically in place for other site components, this specific plugin hook remains unprotected.\nPost-exploitation, the attacker maintains full control over the gateway behavior until an administrator manually reverts the changes. The malicious payload might remain latent in the system, periodically capturing transaction data or redirecting payment flows to unauthorized third-party destinations. Because this vulnerability is accessible remotely via the public-facing URL, no local network access or specialized session state is required to execute the administrative override.\nThe scope of impact is broad, effectively granting the attacker the ability to manipulate the financial data flow of the e-commerce platform. This highlights a critical failure in enforcing secure development practices, specifically concerning the secure management of plugin administrative settings within the WordPress ecosystem."
}