---
id: "CVE-2026-126473"
page: "https://infrastack.ai/live/CVE-2026-126473"
kind: "vulnerability"
aliases: ["CVE-2026-126473"]
title: "OpenEMR: OAuth scope flaws let anonymous users write patient records"
severity: "critical"
cvss: 9.3
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["fhir", "healthcare", "openemr", "runtime", "self-hosted"]
not_affected_if: ["openemr-8.4.0-or-later"]
published_at: "2026-11-13T10:17:56+00:00"
first_seen_at: "2026-11-13T10:47:25+00:00"
updated_at: "2026-11-13T10:48:22+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126473", "first_seen_at": "2026-11-13T10:47:25+00:00"}]
exploit_sources: []
---

# OpenEMR: OAuth scope flaws let anonymous users write patient records

Link for people: https://infrastack.ai/live/CVE-2026-126473 (this .md is for agents)

OpenEMR before 8.4.0 mishandles OAuth scope names, so an unauthenticated attacker can register a client that gets system-level FHIR access without approval. That access lets the attacker read, modify and create Patient records.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the OpenEMR version in the installed application; the sources say versions before `8.4.0` are affected
- Confirm whether dynamic client registration is reachable from the internet on your OpenEMR instance

## Fix

- OpenEMR: move to `8.4.0` or later

## Timeline

- 2026-11-13T10:47:25+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126473

## Documents

- [advisory] Vendor advisory: github.com https://github.com/openemr/openemr/security/advisories/GHSA-6xh3-fmm5-jjp4
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/openemr-before-8.4.0-oauth-authorization-bypass-via-scope-canonicalization

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_