CVE-2026-11990

MEDIUM
Published Jul 10, 2026 Modified Jul 10, 2026 CWE-862

Description

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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CVSS v3.1 Score

5.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS — Exploit Prediction

0.0034
Probability of exploitation
0.26%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-862 Missing Authorization

References

Other References

https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.3.0/app/baseClasses/KCPaymentGatewayFactory.php#L131 https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.3.0/app/controllers/api/AppointmentsController.php#L3931 https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.3.0/app/controllers/api/AppointmentsController.php#L465 https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.3.0/app/paymentGateways/KCPayLater.php#L109 https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.3.0/app/services/KCAppointmentPaymentService.php#L32 https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.4.0/app/baseClasses/KCPaymentGatewayFactory.php#L131 https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.4.0/app/controllers/api/AppointmentsController.php#L3931 https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.4.0/app/controllers/api/AppointmentsController.php#L465 https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.4.0/app/paymentGateways/KCPayLater.php#L109 https://plugins.trac.wordpress.org/browser/kivicare-clinic-management-system/tags/4.4.0/app/services/KCAppointmentPaymentService.php#L32

Frequently Asked Questions

What is CVE-2026-11990? +
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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).
How severe is CVE-2026-11990? +
CVE-2026-11990 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0034, placing it in the 0th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-11990? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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