{"id":"CVE-2026-124481","published":"2026-11-08T14:18:17.300","lastModified":"2026-11-10T21:46:25.193","description":"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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","cwes":["CWE-639"],"vendors":[],"products":[],"references":[{"url":"https://github.com/openemr/openemr/security/advisories/GHSA-525m-fch5-vqqm","tags":[]},{"url":"https://www.vulncheck.com/advisories/openemr-before-8.4.0-cross-patient-payment-tampering-via-rainforest-portal-payments","tags":[]}],"exploitRefs":[{"url":"https://github.com/openemr/openemr/security/advisories/GHSA-525m-fch5-vqqm","tags":[]}],"hasPoc":true,"ai":null}