---
id: CVE-2026-124466
title: OpenEMR before 8.4.0 Unauthenticated SSRF via OAuth2 Client jwks_uri
summary: >-
  OpenEMR before 8.4.0 contains a server-side request forgery vulnerability that
  allows unauthenticated attackers to make the server send HTTP requests by
  registering an OAuth2 client with an unvalidated jwks_uri. Attackers can
  trigger the…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-918
vendor: openemr
product: openemr
affected:
  - openemr < 8.4.0
published: '2026-11-08'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T13:15:51.231Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-124466'
references:
  - url: 'https://github.com/openemr/openemr/security/advisories/GHSA-mf6h-xc62-9fg4'
    label: GitHub Security Advisory (GHSA-mf6h-xc62-9fg4)
  - url: >-
      https://www.vulncheck.com/advisories/openemr-before-8.4.0-unauthenticated-ssrf-via-oauth2-client-jwks-uri
    label: >-
      VulnCheck Advisory: OpenEMR before 8.4.0 Unauthenticated SSRF via OAuth2
      Client jwks_uri
tags:
  - cve.org
ingestedAt: '2026-11-08T13:50:34.975Z'
---

## Overview

OpenEMR before 8.4.0 contains a server-side request forgery vulnerability that allows unauthenticated attackers to make the server send HTTP requests by registering an OAuth2 client with an unvalidated jwks_uri. Attackers can trigger the fetch via the token introspection endpoint with an unsigned client_assertion to probe internal services and reach cloud metadata endpoints.

## Affected

- `openemr < 8.4.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.