CVE-2026-0820 identifies a security vulnerability in the RepairBuddy – Repair Shop CRM & Booking Plugin for WordPress, specifically an Insecure Direct Object Reference (IDOR) caused by missing authorization checks (CWE-862) in the wc_upload_and_save_signature_handler function. This flaw allows any authenticated user with at least Subscriber-level privileges to upload arbitrary signature files to any order within the system. Because the function lacks proper capability checks, attackers can manipulate order metadata and trigger unauthorized status changes, potentially disrupting order processing workflows or causing fraudulent order modifications. The vulnerability affects all plugin versions up to and including 4.1116. The CVSS v3.1 score is 5.3 (medium severity), reflecting that the attack vector is network-based with low attack complexity and no user interaction required, but privileges are needed (authenticated user). Confidentiality is not impacted, but integrity is compromised due to unauthorized data modification. Availability remains unaffected. No public exploits have been reported yet, but the vulnerability could be leveraged by insiders or compromised accounts to manipulate order data. Repair shops using this plugin rely on accurate order metadata and signatures for operational and legal purposes, making this vulnerability a significant risk to business integrity. The lack of patch links indicates that a fix may not yet be publicly available, emphasizing the need for interim mitigations.

For European organizations, especially those operating repair shops or service centers using WordPress with the RepairBuddy plugin, this vulnerability can lead to unauthorized modification of order data, including signatures and status changes. This undermines the integrity of transactional records, potentially causing financial discrepancies, customer disputes, and reputational damage. Attackers with subscriber-level access could exploit this to commit fraud, alter service records, or disrupt business operations. Since the vulnerability does not affect confidentiality or availability, the primary concern is data integrity and trustworthiness of order processing. Given the widespread use of WordPress in Europe and the plugin’s niche in repair services, businesses in this sector are at risk. Regulatory compliance related to data integrity and consumer protection (e.g., GDPR implications if customer data is altered) may also be impacted. The medium severity score suggests moderate urgency but should not be ignored, especially in environments with multiple users having subscriber or higher privileges.

European organizations should immediately audit user roles and permissions within WordPress to ensure that only trusted users have Subscriber-level or higher access, minimizing the attack surface. Implement strict access controls and consider temporarily restricting or disabling the RepairBuddy plugin if possible until a patch is released. Monitor order metadata and signature uploads for unusual or unauthorized changes using logging and alerting mechanisms. Employ Web Application Firewalls (WAFs) to detect and block suspicious requests targeting the vulnerable function. Encourage users to use strong authentication methods and monitor for compromised accounts. Regularly back up order data to enable recovery from unauthorized modifications. Stay informed about vendor updates and apply patches promptly once available. If a patch is not yet released, consider contacting the vendor for guidance or applying custom code fixes to enforce capability checks on the vulnerable function. Conduct security awareness training for staff to recognize potential misuse of their accounts.