CVE-2026-126436

OpenEMR before 8.5.0 OAuth2 Grant Type Enforcement Bypass via Token Endpoint

Published Nov 13, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

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.

Analysis

No analysis available yet

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

openemr

unaffected

Version	Status	Constraints
`0`	affected	< 8.5.0
`8.5.0`	unaffected	—

No data.

No data available yet.

Remediation

No remediation available yet

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.434% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/openemr/openemr/security/advisories/GHSA-qjj7-c4m9-6f92
https://www.vulncheck.com/advisories/openemr-before-8.5.0-oauth2-grant-type-enforcement-bypass-via-token-endpoint

History

Nov 13, 2026 9:45 AM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

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		https://github.com/openemr/openemr/security/advisories/GHSA-qjj7-c4m9-6f92 https://www.vulncheck.com/advisories/openemr-before-8.5.0-oauth2-grant-type-enforcement-bypass-via-token-endpoint
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'}`