CVE-2026-0820 identifies a missing authorization vulnerability (CWE-862) in the RepairBuddy – Repair Shop CRM & Booking Plugin for WordPress, specifically in the wc_upload_and_save_signature_handler function. This function lacks proper capability checks, allowing authenticated users with minimal privileges (Subscriber-level or above) to perform Insecure Direct Object Reference (IDOR) attacks by uploading arbitrary signature files to any order in the system. This unauthorized access enables attackers to modify order metadata and trigger status changes without requiring administrative rights or elevated privileges. The vulnerability affects all plugin versions up to 4.1116, indicating a widespread exposure for users who have not updated. The attack vector is remote network-based, requiring no user interaction beyond authentication. The CVSS 3.1 base score of 5.3 reflects a medium severity, with the primary impact on data integrity, as confidentiality and availability remain unaffected. No public exploits have been reported yet, but the vulnerability presents a risk of fraudulent order manipulation and potential disruption of repair shop operations. The lack of patch links suggests that users must monitor vendor updates or apply custom mitigations. Given the plugin’s role in managing repair orders and bookings, unauthorized modifications could undermine trust and operational accuracy in affected businesses.

The vulnerability allows low-privilege authenticated users to manipulate order data, potentially leading to fraudulent transactions, incorrect order statuses, and disruption of repair shop workflows. This can erode customer trust, cause financial losses, and complicate order fulfillment processes. Since the vulnerability does not affect confidentiality or availability, the primary concern is the integrity of order information. Attackers could exploit this flaw to inject false signatures or alter order statuses, which may result in unauthorized service approvals or denials. For organizations relying heavily on this plugin for customer relationship management and booking, the impact includes operational inefficiencies and reputational damage. The ease of exploitation by users with minimal privileges increases the risk of insider threats or compromised low-level accounts being leveraged for malicious purposes.

Organizations should immediately verify if they are using the RepairBuddy plugin and identify the version in use. Since no official patch links are currently available, administrators should restrict Subscriber-level and other low-privilege user capabilities to prevent access to the vulnerable function. Implementing strict role-based access controls and monitoring user activities related to order modifications can help detect and prevent exploitation. Applying Web Application Firewall (WAF) rules to block unauthorized requests targeting the wc_upload_and_save_signature_handler function is recommended. Additionally, plugin users should regularly check for vendor updates or security advisories to apply patches once released. Conducting thorough audits of order data integrity and signatures can help identify any unauthorized changes. Finally, educating staff about the risks of low-privilege account misuse and enforcing strong authentication mechanisms will reduce exploitation likelihood.