OpenEMR up to 8.3.9 Rainforest Patient Portal Payments portal_payment.rainforest.php patientId/encounter/amount improper authorization

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00+

Summaryinfo

A vulnerability marked as critical has been reported in OpenEMR up to 8.3.9. This affects an unknown part of the file portal_payment.rainforest.php of the component Rainforest Patient Portal Payments. The manipulation of the argument patientId/encounter/amount leads to improper authorization. This vulnerability is listed as CVE-2026-124481. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenEMR up to 8.3.9. It has been rated as critical. This issue affects an unknown code of the file portal_payment.rainforest.php of the component Rainforest Patient Portal Payments. The manipulation of the argument patientId/encounter/amount with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-124481 since 11/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

By approaching the search of inurl:portal_payment.rainforest.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 8.4.0 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Google Hack: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OpenEMR 8.4.0

Timelineinfo

11/08/2026 Advisory disclosed
11/08/2026 +0 days CVE reserved
11/08/2026 +0 days VulDB entry created
11/08/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CNA: VulnCheck
CVE: CVE-2026-124481 (🔒)

GCVE (CVE): GCVE-0-2026-124481
GCVE (VulDB): GCVE-100-432863

Entryinfo

Created: 11/08/2026 14:52
Changes: 11/08/2026 14:52 (78)
Complete: 🔍
Cache ID: 216::103

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