---
id: CVE-2026-103021
title: 'OpenEMR: Username Enumeration via Pre-Authentication User Settings Loading'
summary: >-
  OpenEMR is a free and open source electronic health records and medical
  practice management application. From 6.0.0 until 8.3.0, interface/globals.php
  uses the unauthenticated authUser login parameter to populate temp_authuserid
  and load…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-200
  - CWE-203
  - CWE-208
vendor: openemr
product: openemr
affected:
  - 'openemr >= 6.0.0, < 8.3.0'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:06:36.954Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-103021'
references:
  - url: 'https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff'
    label: 'https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff'
  - url: 'https://github.com/openemr/openemr/pull/13133'
    label: 'https://github.com/openemr/openemr/pull/13133'
  - url: >-
      https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5
    label: >-
      https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5
  - url: 'https://github.com/openemr/openemr/releases/tag/v8_3_0'
    label: 'https://github.com/openemr/openemr/releases/tag/v8_3_0'
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.696Z'
---

## Overview

OpenEMR is a free and open source electronic health records and medical practice management application. From 6.0.0 until 8.3.0, interface/globals.php uses the unauthenticated authUser login parameter to populate temp_authuserid and load that account's user_settings before authentication succeeds. Existing usernames can therefore cause an additional database query and may apply visible customized settings, while nonexistent usernames skip that behavior. A remote unauthenticated actor can use timing or page differences to enumerate valid accounts for later credential attacks. This issue is fixed in version 8.3.0.

## Affected

- `openemr >= 6.0.0, < 8.3.0`

## Remediation

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