OPENEMR · CVE-2026-124481 · Other
NO FIX YET · SEE WHAT TO DO
In OpenEMR before 8.4.0, the Rainforest patient portal payment handler trusts patientId, encounter and amount values sent by the browser. An authenticated patient can alter the request so the payment webhook records forged credits against other patients' encounters, exceeding what was actually paid.
first public Sep 13, 2026 · 1 source
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Clinics and organizations that run OpenEMR with the patient portal and Rainforest payments enabled are exposed. An attacker needs a valid patient portal login. Installations on OpenEMR 8.4.0 or later, or without Rainforest payments, are not affected.
Not affected if no-patient-portal, no-rainforest-payments, openemr-8.4.0-or-later
Who cares healthcare, openemr, patient-portal, rainforest-payments, self-hosted
8.4.0 are affected.8.4.0 or later.OpenEMR before 8.4.0 contains an improper authorization vulnerability in Rainforest patient portal payments that trusts browser-supplied patientId, encounter, and amount values instead of deriving them from the portal session. Authenticated portal patients can tamper with JSON sent to portal_payment.rainforest.php so the payin.authorized webhook writes forged ar_activity credits to other patients' encounters exceeding the amount actually paid.
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