CVE-2026-40792 Overview
CVE-2026-40792 is an Insecure Direct Object Reference (IDOR) vulnerability affecting the KiviCare Clinic Management System WordPress plugin versions 4.2.1 and earlier. The flaw allows authenticated users with Subscriber-level privileges to access or manipulate resources belonging to other users by directly referencing object identifiers. The vulnerability is categorized under [CWE-639] (Authorization Bypass Through User-Controlled Key) and impacts confidentiality, integrity, and availability of clinic data managed by the plugin.
Critical Impact
Low-privileged authenticated users can bypass authorization controls and access patient or clinic records outside their scope, exposing sensitive medical data.
Affected Products
- KiviCare Clinic Management System WordPress plugin versions <= 4.2.1
- WordPress installations running vulnerable KiviCare releases
- Healthcare and clinic management sites depending on the affected plugin
Discovery Timeline
- 2026-06-15 - CVE-2026-40792 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-40792
Vulnerability Analysis
The vulnerability stems from missing authorization checks in KiviCare request handlers that accept object identifiers from user-controlled input. The plugin trusts the supplied identifier without validating whether the requesting subscriber owns or has rights to the referenced resource. Attackers authenticated as Subscribers can enumerate or guess object IDs to read or modify records belonging to other accounts.
KiviCare manages sensitive clinic data including patient profiles, appointments, and medical records. Broken object-level authorization in this context exposes protected health information to unauthorized actors. The EPSS probability of 0.249% places the vulnerability at the 15.95 percentile of public exploitation likelihood, but the low barrier to a Subscriber account on many WordPress sites raises real-world risk.
Root Cause
The root cause is improper authorization enforcement on resource-accessing endpoints. The plugin uses direct references such as numeric IDs in request parameters without verifying ownership through a server-side access control check. This pattern matches [CWE-639] and is a common failure in plugins that delegate identification but not authorization checks.
Attack Vector
Exploitation requires network access and valid Subscriber credentials on the target WordPress site. The attacker submits a crafted request to a vulnerable KiviCare endpoint with a modified object identifier referencing another user's record. The server returns or modifies the resource because it does not validate ownership. Detailed technical analysis is available in the Patchstack KiviCare Vulnerability Advisory.
Detection Methods for CVE-2026-40792
Indicators of Compromise
- Subscriber-account HTTP requests to KiviCare endpoints referencing object IDs outside the user's normal scope
- Unexpected reads or writes to patient, appointment, or clinic records initiated by low-privileged accounts
- Sequential or enumerated ID values in admin-ajax.php or KiviCare REST routes from a single session
Detection Strategies
- Review WordPress access logs for Subscriber-level sessions issuing requests to KiviCare administrative or record-access endpoints
- Correlate plugin audit logs with WordPress user roles to detect cross-tenant record access
- Inspect web application firewall logs for parameter tampering patterns targeting KiviCare object identifiers
Monitoring Recommendations
- Enable verbose logging on the KiviCare plugin and WordPress REST API to capture request parameters and authenticated user IDs
- Alert on anomalous spikes in record access volume from non-administrative accounts
- Track newly registered Subscriber accounts that immediately query record-access endpoints
How to Mitigate CVE-2026-40792
Immediate Actions Required
- Upgrade KiviCare Clinic Management System to a version newer than 4.2.1 once the vendor releases a patched build
- Audit existing WordPress Subscriber accounts and remove unused or untrusted registrations
- Restrict open user registration on WordPress sites running KiviCare if not operationally required
Patch Information
Refer to the Patchstack KiviCare Vulnerability Advisory for the latest patched version and remediation guidance from the vendor.
Workarounds
- Disable the KiviCare plugin until a patched release is installed and verified
- Apply web application firewall rules that block parameter tampering against KiviCare endpoints
- Disable public WordPress account registration to reduce the pool of authenticated attackers
# Disable open registration in wp-config.php or via WP-CLI
wp option update users_can_register 0
# Deactivate the KiviCare plugin until patched
wp plugin deactivate kivicare-clinic-management-system
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
