---
id: "CVE-2026-126426"
page: "https://infrastack.ai/live/CVE-2026-126426"
kind: "vulnerability"
aliases: ["CVE-2026-126426"]
title: "OpenEMR: missing authentication lets session holders change MFA factors"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["healthcare", "openemr", "package", "php", "self-hosted"]
not_affected_if: ["mfa-not-enabled", "version-8.5.0-or-later"]
published_at: "2026-11-13T10:17:48+00:00"
first_seen_at: "2026-11-13T10:47:21+00:00"
updated_at: "2026-11-13T10:57:15+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126426", "first_seen_at": "2026-11-13T10:47:21+00:00"}]
exploit_sources: []
---

# OpenEMR: missing authentication lets session holders change MFA factors

Link for people: https://infrastack.ai/live/CVE-2026-126426 (this .md is for agents)

OpenEMR 5.0.2 before 8.5.0 has a missing authentication check in its MFA registration pages, so anyone holding a logged-in user's session can delete that user's second factors or register their own U2F key. The attacker can then log in with the password alone and bypass MFA.

_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; versions from `5.0.2` up to but not including `8.5.0` are listed as affected.
- Look for `mfa_registrations.php` and `mfa_u2f.php` in the OpenEMR web root.

## Fix

- OpenEMR: upgrade to `8.5.0` or later, per the product ranges.

## Timeline

- 2026-11-13T10:47:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126426

## Documents

- [advisory] Vendor advisory: github.com https://github.com/openemr/openemr/security/advisories/GHSA-rcrp-xxch-gxfh
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/openemr-5.0.2-before-8.5.0-missing-re-authentication-for-mfa-factor-deletion-and-u2f-registration
- [fix] Patch: github.com https://github.com/openemr/openemr/commit/e0dee295497bba763151913bde563a826c739cd7

## From the sources

OpenEMR 5.0.2 before 8.5.0 contains a missing authentication vulnerability in mfa_registrations.php and mfa_u2f.php that allows session hijackers to delete MFA factors or register U2F keys without password re-entry. Attackers holding a victim's authenticated session can remove all second factors or add their own U2F key, bypassing MFA at later logins with the password.

---

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