CVE-2020-36696 in Product Input Fields for WooCommerce Plugin
Summary
by MITRE • 06/07/2023
The Product Input Fields for WooCommerce plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on the handle_downloads() function in versions up to, and including, 1.2.6. This makes it possible for unauthenticated attackers to download files from the vulnerable service.
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Analysis
by VulDB Data Team • 04/09/2026
The vulnerability identified as CVE-2020-36696 affects the Product Input Fields for WooCommerce plugin, which is a widely used extension for WordPress e-commerce sites. This plugin enables merchants to add custom input fields to their product pages, allowing customers to provide additional information during the purchasing process. The flaw exists within the handle_downloads() function, which is responsible for managing file downloads associated with these custom product inputs. The vulnerability represents a critical authorization bypass issue that fundamentally compromises the security model of the plugin.
The technical implementation of this vulnerability stems from a missing capability check within the handle_downloads() function. This function, which should require proper authentication and authorization before allowing file access, fails to verify whether the requesting user possesses the necessary permissions to download specific files. The absence of this crucial access control mechanism means that any unauthenticated attacker can exploit this function to gain unauthorized access to downloadable files. This flaw directly violates the principle of least privilege and demonstrates a classic authorization bypass vulnerability that falls under CWE-863, which specifically addresses "Incorrect Authorization." The vulnerability exists in all versions up to and including 1.2.6, indicating that the development team failed to implement proper access controls during the function's development.
The operational impact of this vulnerability is severe and far-reaching for affected WordPress installations. Unauthenticated attackers can exploit this weakness to download files that should only be accessible to authorized users, potentially including sensitive customer data, product specifications, marketing materials, or proprietary content. This unauthorized access can lead to data breaches, intellectual property theft, and compliance violations that may result in significant financial and reputational damage. The vulnerability affects not just individual files but entire download repositories, making it a particularly dangerous flaw for e-commerce sites that rely on secure file distribution. The attack surface is further expanded because WordPress sites using this plugin are often targeted by automated scanning tools that specifically look for such authorization bypass vulnerabilities.
Organizations affected by this vulnerability should immediately implement mitigations to protect their systems. The primary and most effective solution involves upgrading to the latest version of the Product Input Fields for WooCommerce plugin where the capability check has been properly implemented. Security teams should also consider implementing additional protective measures such as restricting access to download endpoints through web application firewalls, implementing rate limiting on file download requests, and monitoring for unusual download patterns that might indicate exploitation attempts. Network segmentation and access controls should be reviewed to limit exposure, while regular security audits should be conducted to identify similar authorization bypass vulnerabilities in other plugins or custom code. This vulnerability demonstrates the critical importance of proper access control implementation and serves as a reminder of the need for comprehensive security testing throughout the software development lifecycle, particularly in areas involving file access and user authentication. The ATT&CK framework would categorize this vulnerability under T1078 for Valid Accounts and T1566 for Phishing, as attackers could leverage this flaw to gain unauthorized access to resources that would normally require authentication.