CVE-2026-126473OpenEMR before 8.4.0 OAuth Authorization Bypass via Scope Canonicalization

OpenEMR before 8.4.0 contains OAuth scope canonicalization and containment flaws that allow unauthenticated attackers to obtain unapproved system-level FHIR access. Attackers can register a colon-form system:Patient.read client that bypasses approval, then request unregistered system/Patient.write scope to read, modify, and create Patient records.

9.3 CRITICALNot in KEVNVD: Awaiting Analysis

Last updated: 2026-11-13 10:17 UTC

OverviewCVSS details

9.3CRITICALCVSS 4.0

Score source: VulnCheck (CNA)
NVD status: Awaiting Analysis
Published: Nov 13, 2026
Assigner: VulnCheck

Affected

openemr (openemr)

Versions: before 8.4.0
Fixed in: 8.4.0

Exploitation

Public exploit: None listed
CISA KEV: Not listed
KEV due date: —

EPSS

No EPSS score yet.

CVSS 4.0 · VulnCheck (CNA)

9.3Critical

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: None
User interaction: None
Confidentiality impact: High
Integrity impact: High
Availability impact: None
Confidentiality (other systems): None
Integrity (other systems): None
Availability (other systems): None

CVSS 3.1 · VulnCheck (CNA)

9.1Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: None

NVD status: Awaiting Analysis

Overview Affected Products References

Overview

Severity

Score	Severity	Version	Technologies Affected
9.3	CRITICAL	4.0VulnCheck (CNA)	Openemr
9.1	CRITICAL	3.1VulnCheck (CNA)	Openemr

Details

CVE ID: CVE-2026-126473
Status: Awaiting Analysis
Assigner (CNA): VulnCheck
Published: Nov 13, 2026
Last modified: 2026-11-13 10:17 UTC
Weaknesses: CWE-863 · Incorrect Authorization

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-13 12:10 UTC.