Mercado Pago payments for WooCommerce <= 8.7.11 - Missing Authorization to Unauthenticated PIX Payment QR Code Image Disclosure
Strategic Overview
- Status
- Patched in 8.7.12
- Affected Plugin
- Mercado Pago payments for WooCommerce
- Affected Version
<= 8.7.11- CVSS
- 5.3Medium
- Weakness type
- CWE-862 · Missing Authorization
- CVE
CVE-2026-3208
At a glance
CVE-2026-3208 is a medium-severity Missing Authorization vulnerability in the Mercado Pago payments for WooCommerce WordPress plugin, affecting versions <= 8.7.11. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 8.7.12; sites on affected versions should update now. Disclosed May 2026, reported by Muhammad Sharief.
Vulnerability Overview
The Mercado Pago payments for WooCommerce plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the 'mp_pix_image' WooCommerce API endpoint in all versions up to, and including, 8.7.11. This makes it possible for unauthenticated attackers to retrieve PIX payment QR code images for arbitrary orders. PIX QR codes contain sensitive merchant information including PIX keys (which may be CPF/CNPJ personal identifiers), transaction amounts, merchant name and city, and MercadoPago transaction references.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-862: Missing Authorization
Mercado Pago payments for WooCommerce <= 8.7.11 carries this weakness at mp_pix_image, and reaching it takes no account at all. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.
Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Mercado Pago payments for WooCommerce the fix is 8.7.12: builds <= 8.7.11 are affected, anything from 8.7.12 onward is not.
Remediation
Update to version 8.7.12, or a newer patched version
How does WordSec protect against this?
This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Mercado Pago payments for WooCommerce 8.7.12 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Mercado Pago payments for WooCommerce
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