CVE-2026-0820 in RepairBuddy Plugin
Summary
by MITRE • 01/17/2026
The RepairBuddy – Repair Shop CRM & Booking Plugin for WordPress plugin for WordPress is vulnerable to Insecure Direct Object Reference due to missing capability checks on the wc_upload_and_save_signature_handler function in all versions up to, and including, 4.1116. This makes it possible for authenticated attackers, with Subscriber-level access and above, to upload arbitrary signatures to any order in the system, potentially modifying order metadata and triggering unauthorized status changes.
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Analysis
by VulDB Data Team • 01/18/2026
The CVE-2026-0820 vulnerability affects the RepairBuddy WordPress plugin, which serves as a comprehensive CRM and booking solution for repair shops. This plugin handles critical business operations including order management, customer relationships, and service scheduling. The vulnerability stems from an insecure direct object reference flaw that exists within the wc_upload_and_save_signature_handler function, a core component responsible for processing digital signatures associated with service orders. The flaw specifically manifests in versions up to and including 4.1116, making all installations within this range susceptible to exploitation.
The technical implementation of this vulnerability occurs through the absence of proper capability checks within the signature upload handler function. When authenticated users with subscriber-level privileges or higher attempt to upload signatures, the system fails to validate whether the user has legitimate authorization to modify the target order. This missing authorization check creates a direct object reference vulnerability where attackers can manipulate the order identifiers in their requests to target any order within the system. The vulnerability is classified under CWE-284, which specifically addresses inadequate access control mechanisms, and aligns with ATT&CK technique T1078.004 for valid accounts, as it exploits existing user privileges rather than requiring privilege escalation.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads, as it enables attackers to modify order metadata and potentially trigger unauthorized status changes within the repair shop's workflow. An attacker with subscriber-level access could upload malicious signatures to orders they do not own, leading to potential data integrity compromises and operational disruption. The ability to modify order metadata might include altering service descriptions, customer information, or pricing details, while unauthorized status changes could affect inventory management, scheduling, and financial reporting. This vulnerability directly impacts the confidentiality, integrity, and availability of the repair shop's business data, potentially causing financial loss and operational inefficiencies.
Organizations utilizing the RepairBuddy plugin should immediately implement multiple layers of mitigation strategies to address this vulnerability. The primary recommendation involves updating to the latest plugin version where the capability checks have been properly implemented and validated. Security patches should include comprehensive access control validation that verifies both the authenticated user's privileges and their authorization to modify specific order objects. Network segmentation and monitoring should be enhanced to detect unusual signature upload patterns, particularly those targeting orders outside the user's typical scope of responsibility. Additionally, implementing role-based access controls that limit signature upload capabilities to authorized personnel only will provide defense-in-depth protection against similar vulnerabilities. Regular security audits of WordPress plugins and adherence to the principle of least privilege should be maintained to prevent exploitation of similar insecure direct object reference flaws across the organization's digital infrastructure.