CVE-2026-8678 in MyParcel Plugin
Summary
by MITRE • 07/11/2026
The MyParcel plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 4.25.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to view and modify shipment options — including carrier, delivery type, package type, number of labels, weight, signature requirement, and insurance — on any arbitrary order.
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Analysis
by VulDB Data Team • 07/11/2026
The MyParcel WordPress plugin vulnerability represents a critical authorization bypass flaw that undermines the security posture of e-commerce platforms relying on this shipping solution. This weakness affects all versions up to and including 4.25.1, creating a persistent risk for online retailers who depend on proper access controls to protect their operational workflows. The vulnerability stems from inadequate user permission verification mechanisms within the plugin's codebase, allowing unauthorized modifications to shipment configurations that should remain restricted to authorized personnel.
The technical implementation of this flaw demonstrates a failure in input validation and access control enforcement, which aligns with common CWE categories related to insufficient authorization checks and privilege escalation vulnerabilities. Attackers with subscriber-level access or higher can exploit this weakness to manipulate shipment parameters including carrier selection, delivery type configurations, package specifications, label quantities, weight settings, signature requirements, and insurance options for any order within the system. This unauthorized modification capability directly violates fundamental security principles of least privilege and proper access control enforcement.
The operational impact of this vulnerability extends beyond simple data integrity concerns to potentially compromise supply chain operations and customer satisfaction. Attackers could manipulate delivery configurations to redirect shipments, alter delivery timing, or modify package requirements, leading to financial losses, customer service issues, and potential legal ramifications. The ability to modify insurance settings particularly poses significant financial risk as it could enable attackers to reduce or eliminate coverage on valuable shipments, creating liability exposure for retailers.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1078 004 which covers legitimate credentials, as attackers can leverage existing subscriber accounts to perform unauthorized actions within the plugin's administrative interface. The flaw creates an attack surface that allows privilege escalation from subscriber level to shipment configuration manipulation without requiring elevated privileges or additional authentication mechanisms. Organizations should implement immediate mitigations including patching to the latest plugin version, reviewing user access levels, and implementing additional monitoring for unauthorized shipment modifications.
Security best practices recommend that all WordPress plugins implement robust access control verification before executing administrative functions, particularly those affecting financial transactions or operational workflows. The vulnerability highlights the importance of proper privilege validation in plugin development and demonstrates how seemingly minor authorization gaps can create significant operational security risks. Organizations should conduct comprehensive security assessments of their WordPress environments to identify similar vulnerabilities in other plugins that might be affected by improper access control implementations.
The remediation approach involves updating to a patched version of the MyParcel plugin where proper authorization checks have been implemented, ensuring that all user actions are validated against appropriate permission levels before execution. Additionally, administrators should implement logging and monitoring for shipment configuration changes to detect potential exploitation attempts, while also reviewing existing user permissions to minimize the attack surface through principle of least privilege enforcement.