Description

Unauthenticated Insecure Direct Object References (IDOR) in Mercado Pago payments for WooCommerce <= 8.9.0 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.3",
  "pubDate": "2026-08-06T15:16:53.937Z",
  "pubdate": "2026-08-06T15:16:53.937Z",
  "executiveSummary": "An unauthenticated Insecure Direct Object References (IDOR) vulnerability has been identified within the Mercado Pago payments for WooCommerce plugin affecting versions <= 8.9.0. This security flaw introduces significant risk by allowing unauthenticated remote threat actors to interact with payment references or transaction objects directly via manipulated parameters without proper authorization checks. The impact of this vulnerability encompasses unauthorized access to sensitive transaction data, potential manipulation of payment states, and logical bypasses in the order processing workflow. The flaw stems from insufficient access control validation and a failure to cryptographically sign or properly authorize object references tied to payment processing endpoints exposed by the plugin. Attackers do not require prior authentication, elevated privileges, or specialized pre-existing internal access to execute the exploit, relying solely on network exposure to the vulnerable HTTP endpoints handled by the plugin. Exploitation requirements are minimal, as automated scanning or manual manipulation of predictable or sequential payment identifiers can trigger the insecure reference resolution. Consequently, organizations utilizing vulnerable installations of Mercado Pago payments for WooCommerce face potential financial logic manipulation and data exposure risks, necessitating immediate remediation actions such as updating to a patched version once available or implementing strict network-level controls.",
  "technicalDetails": "The vulnerability is classified as an Insecure Direct Object Reference (IDOR) residing within the payment processing functionality of the Mercado Pago payments for WooCommerce plugin for versions <= 8.9.0. The root cause of the issue lies in the application's failure to enforce rigorous server-side authorization and access control checks when handling requests directed at payment objects or order references. Specifically, endpoints exposed by the plugin accept direct references to internal transaction identifiers, order IDs, or payment metadata without validating whether the requesting entity possesses the necessary authorization or session context to access or modify the requested resource.\nThe attack flow begins with network reconnaissance where an unauthenticated attacker identifies the exposed HTTP endpoints responsible for handling payment status queries, webhook simulations, or transaction retrievals within the Mercado Pago payments for WooCommerce plugin. Because the affected software processes these requests without verifying session validity or enforcing ownership checks between the requester and the transaction object, the attacker can systematically manipulate the parameter values representing the target object references.\nDuring exploitation, the attacker crafts malicious HTTP requests containing altered object identifiers—such as incremented or guessed transaction IDs—and transmits them to the vulnerable endpoint over the network. The vulnerable component processes the incoming payload, retrieves the corresponding database record or external API reference associated with the supplied identifier, and returns sensitive transaction details or executes logic based on the manipulated reference without confirming authorization.\nThe authentication and privilege requirements for this attack are entirely absent, as the vulnerability is explicitly unauthenticated, allowing any external entity with network access to the web store to issue the malicious requests. The post-exploitation impact includes the potential unauthorized enumeration of customer transaction data, exposure of sensitive order metadata, and possible interference with payment verification routines, leading to financial discrepancies or unauthorized order status transitions within the WooCommerce environment."
}