CVE-2026-11990 in KiviCare Plugin
Summary
by MITRE • 07/10/2026
The KiviCare – Clinic & Patient Management System (EHR) plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 4.4.0. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to mark arbitrary pending appointments as Confirmed and forge an associated completed payment record in wp_kc_payments_appointment_mappings using an attacker-supplied payment ID, bypassing payment entirely. This exploit is achievable on a default installation because the gateway resolution logic returns all registered gateways regardless of admin-enabled status, making the manual (KCPayLater) gateway always selectable.
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Analysis
by VulDB Data Team • 07/10/2026
The KiviCare plugin for WordPress presents a critical authorization bypass vulnerability that affects all versions up to and including 4.4.0, representing a significant security flaw in healthcare management systems. This vulnerability stems from inadequate user authentication verification mechanisms within the plugin's core functionality, specifically targeting the electronic health record management capabilities. The flaw allows unauthenticated attackers to manipulate appointment status and payment records without proper authorization, creating a dangerous scenario where malicious actors can compromise patient scheduling and financial data integrity. The vulnerability manifests through improper access control validation during appointment confirmation processes, where the system fails to verify user credentials before executing critical operations.
The technical implementation of this vulnerability exploits a fundamental flaw in the plugin's gateway resolution logic that operates outside proper administrative controls. The system returns all registered payment gateways regardless of their enabled status within the admin configuration, effectively making the manual KCPayLater gateway always selectable even when disabled by administrators. This design flaw creates a pathway for attackers to manipulate payment records by supplying arbitrary payment IDs during appointment confirmation processes. The vulnerability specifically targets the wp_kc_payments_appointment_mappings database table where forged completed payment records can be created, bypassing legitimate payment processing mechanisms entirely.
The operational impact of this authorization bypass extends beyond simple data manipulation to encompass serious healthcare security implications. Unauthenticated attackers can mark pending appointments as confirmed, potentially causing scheduling conflicts and disrupting legitimate patient care operations while simultaneously creating fraudulent payment records that appear legitimate within the system's database structure. This vulnerability affects default installations without requiring any special configuration or privileges from attackers, making it particularly dangerous in healthcare environments where patient data protection is paramount. The compromised system allows malicious actors to gain unauthorized access to appointment management functions and financial transaction processing capabilities.
Security mitigation strategies should focus on implementing proper authentication checks before allowing any appointment confirmation or payment record modifications. The plugin requires immediate updates to validate user authorization status for all critical operations, particularly those involving payment processing and appointment status changes. Administrators should ensure that only enabled payment gateways are selectable during the checkout process, preventing exploitation of disabled payment methods. The vulnerability aligns with CWE-285 which addresses improper authorization in software systems, and represents a clear violation of the principle of least privilege. From an attack perspective, this vulnerability maps to techniques described in the ATT&CK framework under privilege escalation and credential access categories, specifically targeting the persistence and privilege escalation phases where unauthorized users can gain elevated access to sensitive healthcare data and financial processing functions.