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HIGH severity

CVE-2026-126442 — Openemr

HIGH

CVE-2026-126442 is a high-severity (CVSS 8.1) Missing Authorization vulnerability in openemr openemr. A fix is available — see the affected versions and patch details below.

OpenEMR before 8.5.0 contains a missing authorization vulnerability in create_portallogin.php that allows low-privilege authenticated users to replace patient portal credentials without…

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Nov 13, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs31th percentile — riskier than 31% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Description

OpenEMR before 8.5.0 contains a missing authorization vulnerability in create_portallogin.php that allows low-privilege authenticated users to replace patient portal credentials without ACL checks. Attackers can select a victim patient in session and post replacement credentials to take over portal accounts, read PHI, and lock patients out.

Affected Products

1 product · 1 configurations
Application
openemropenemr
< 8.5.0
1 version
0

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every openemr openemr deployment and check each version against the affected-products list above.

  2. Fix

    Apply the openemr openemr security patch or hotfix for CVE-2026-126442 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

OpenEMR before 8.5.0 contains a missing authorization vulnerability in create_portallogin.php that allows low-privilege authenticated users to replace patient portal credentials without ACL checks. Attackers can select a victim patient in session and post replacement credentials to take over portal accounts, read PHI, and lock patients out.
O3 Security · Runtime Protection

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