CVE-2026-81794 in Shirt Product Designer Plugin
Summary
by MITRE • 09/10/2026
Unauthenticated Broken Access Control in Shirt Product Designer for WooCommerce 1.0.4 versions.
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Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified as an unbroken access control issue within the Shirt Product Designer plugin for WordPress, specifically affecting version 1.0.4 and earlier iterations, represents a critical failure in server-side authorization mechanisms. This flaw allows any individual with network connectivity to the targeted web application to bypass authentication requirements entirely. In standard secure architectures, actions that modify data or expose sensitive information must be preceded by verification of the user's identity and their specific permissions relative to the requested action. However, due to insufficient validation checks within the plugin’s codebase, these safeguards are effectively neutralized, granting unauthorized actors direct access to administrative functions or restricted resources without needing valid credentials.
From a technical perspective, this vulnerability stems from improper implementation of role-based access control principles where endpoints designed for authenticated administrators are exposed publicly via HTTP requests. The attacker can interact with the application’s API or internal handlers directly by crafting specific malicious payloads that exploit missing session validation tokens or nonce verification failures. This type of flaw is commonly categorized under CWE-284, which describes Improper Access Control, and aligns closely with MITRE ATT&CK technique T1078, Valid Accounts, although in this case the attacker does not even need valid accounts to initiate exploitation because the system fails to reject unauthenticated requests intended for privileged operations.
The operational impact of such a vulnerability is severe, potentially leading to complete compromise of the WordPress installation hosting the e-commerce platform. An adversary could manipulate product designs, alter pricing structures, inject malicious code into customer-facing content, or extract sensitive database information including user credentials and payment details stored within the WooCommerce environment. Since this plugin handles visual customization tools for products, an attacker might also deface storefronts by uploading inappropriate images through the designer interface, causing significant reputational damage to the business owner. Furthermore, if the server configuration allows further exploitation of these elevated privileges, it could serve as a pivot point for deeper network intrusion, enabling lateral movement within the organization’s infrastructure.
Mitigation strategies must prioritize immediate remediation and defensive hardening measures. The most effective solution is to upgrade the Shirt Product Designer plugin to version 1.0.5 or later where this access control logic has been corrected by the developers. Until an update can be applied, administrators should implement web application firewall rules that restrict direct HTTP POST requests to specific vulnerable endpoints unless they originate from trusted internal sources or include valid authentication headers. Additionally, enforcing strict file permissions on plugin directories and disabling XML-RPC if not required can reduce the attack surface. Regular security audits using static analysis tools focused on detecting missing authorization checks are recommended to prevent similar issues in future updates or other plugins integrated into the WordPress ecosystem.