# CVE-2026-103021: OpenEMR: Username Enumeration via Pre-Authentication User Settings Loading

Status: published. Published: 2026-11-05. Updated: 2026-11-09.

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.

## Remediation

- fix: openemr/openemr (composer): GitHub reports patched versions 8.3.0. Check the advisory for the affected release branch. (source: GitHub GHSA-rr38-hpxq-wwff) — https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff

## Affected products and versions

- openemr / openemr: >= 6.0.0, < 8.3.0 (affected). Source: CNA: GitHub_M
-  / openemr/openemr (openemr/openemr): >=6.0.0 <=8.3.0 (affected, GitHub advisory range). Source: GitHub GHSA-rr38-hpxq-wwff

## Severity and prioritization

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: CNA: GitHub_M

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-09; percentile 28.30%

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-200, CWE-203, CWE-208

## Exploit evidence

- exploit: https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff (ADP: CISA-ADP)

## References

- https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/openemr/openemr/pull/13133 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/openemr/openemr/releases/tag/v8_3_0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff (ADP: CISA-ADP; exploit)

- https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5 (security-advisories@github.com)

- https://github.com/openemr/openemr/pull/13133 (security-advisories@github.com)

- https://github.com/openemr/openemr/releases/tag/v8_3_0 (security-advisories@github.com)

- https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff (security-advisories@github.com)

- https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff (GitHub Security Advisories; advisory)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-103021; retrieved 2026-11-09; source updated 2026-11-09

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103021; retrieved 2026-11-07; source updated 2026-11-06

- GitHub Security Advisories: https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff; retrieved 2026-11-07; source updated 2026-10-01

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-103021; retrieved 2026-11-09; source updated Not reported

Revision: 9312c77172c3920375afa704f41ebd04a1656d428ca15da78d12462bc198ff02

Canonical: https://y2.dev/cve/CVE-2026-103021

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