Description
OpenEMR before 8.5.0 contains an authorization bypass vulnerability that allows OAuth2 clients to use unregistered grant types because oauth_clients.grant_types is never enforced. Attackers can request tokens with grant_type=password to bypass the user consent screen, and disabled clients can redeem authorization codes using JWT client assertions.
Published: 2026-11-13
Score: 8.7 High
EPSS: n/a
KEV: No
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 13 Nov 2026 09:45:00 +0000

Type Values Removed Values Added
Description OpenEMR before 8.5.0 contains an authorization bypass vulnerability that allows OAuth2 clients to use unregistered grant types because oauth_clients.grant_types is never enforced. Attackers can request tokens with grant_type=password to bypass the user consent screen, and disabled clients can redeem authorization codes using JWT client assertions.
Title OpenEMR before 8.5.0 OAuth2 Grant Type Enforcement Bypass via Token Endpoint
First Time appeared Open-emr
Open-emr openemr
Weaknesses CWE-862
CPEs cpe:2.3:a:open-emr:openemr:*:*:*:*:*:*:*:*
Vendors & Products Open-emr
Open-emr openemr
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

Open-emr Openemr
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-13T09:35:22.891Z

Reserved: 2026-11-10T21:37:25.685Z

Link: CVE-2026-126436

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-13T10:17:50.510

Modified: 2026-11-13T10:17:50.620

Link: CVE-2026-126436

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses