CVE-2026-94299 in elegro Crypto Payment Plugin
Summary
by MITRE • 10/06/2026
The elegro Crypto Payment WordPress plugin through 1.0.1 does not require a shared secret to be configured before trusting incoming payment notification requests, allowing unauthenticated attackers to forge payment confirmations and change the status of arbitrary orders on any installation where that secret has been left at its default empty value.
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified in the elegro Crypto Payment WordPress plugin version 1.0.1 represents a critical failure in authentication logic within the payment processing workflow. This flaw stems from an improper validation of incoming webhook or notification requests designed to confirm cryptocurrency payments. Specifically, the application fails to enforce the configuration and verification of a shared secret key before accepting these notifications as legitimate. In secure integrations with external payment gateways, it is standard practice to require both parties to share a cryptographic secret that serves as a proof of origin for each transaction callback. By omitting this requirement when the default empty value remains in place, the plugin effectively removes any mechanism to distinguish between genuine payment confirmations sent by the crypto provider and maliciously forged requests generated by an attacker.
From a technical perspective, this issue is classified under CWE-287 Improper Authentication because the system fails to properly verify the identity of the entity sending the request. The operational impact is severe for any merchant using default configuration settings, which are common in newly installed or poorly maintained WordPress sites. An unauthenticated attacker can exploit this by crafting and submitting forged HTTP POST requests that mimic valid payment notifications. By manipulating parameters such as order ID, transaction hash, and status indicators within these fake payloads, the attacker can trick the application into marking orders as paid when no actual funds have been received. This capability allows for arbitrary state changes to e-commerce transactions without any financial exchange occurring in reality.
The consequences of this vulnerability extend beyond simple fraud; they compromise the integrity of the entire sales pipeline and erode customer trust. Merchants may inadvertently fulfill goods or services based on false payment confirmations, leading directly to financial loss equal to the value of the shipped items or provided services. Furthermore, if an attacker can repeatedly forge successful payments for low-value orders while withholding high-value ones, they might attempt to manipulate inventory levels or trigger automated workflows that depend on accurate order status data. This type of attack is often categorized under ATT&CK technique T1496 Resource Hijacking in the context of cloud environments, but more accurately aligns with T1078 Valid Accounts if we consider the abuse of trusted system states, though strictly speaking it fits best within lateral movement or persistence via compromised application logic. However, for web applications specifically, this is a classic example of CWE-345 Insufficient Verification of Data Authenticity which leads to CWE-269 Improper Privilege Escalation in terms of business logic privileges.
Mitigation strategies must focus on immediate remediation and long-term security hardening. Administrators should immediately update the elegro Crypto Payment plugin to a patched version where this validation is enforced, or if no patch exists, disable the auto-confirmation feature until it can be manually verified by staff. It is imperative that all installations configure a strong, unique shared secret key provided by the cryptocurrency payment processor and ensure this setting is never left blank. Additionally, implementing IP allowlisting for webhook endpoints can add an extra layer of defense by restricting which source addresses are permitted to send notification requests. Regular security audits should include checks for default credentials or empty configuration fields in all third-party plugins to prevent similar logical flaws from being exploited across the WordPress ecosystem.