CVE-2026-126438
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Improper Authorization in OpenEMR Allows Rule Record Modification

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
OpenEMR before 8.5.0 contains an improper authorization vulnerability in interface/patient_file/rules/patient_data.php that allows read-only patients/med users to modify clinical-rule records. Attackers can submit a global form_entryID row ID to overwrite completion date, state, and result, including records of patients outside their configured squad.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-126438
EUVD
EUVD-2026-125005

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
openemr openemr to 8.5.0 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

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Executive Summary

OpenEMR before version 8.5.0 has an improper authorization flaw in the Clinical-Rule Editor. Users with read-only or patient/med permissions can modify clinical-rule records by submitting a global form_entryID to overwrite fields like completion date, state, and result. This includes records of patients outside their assigned group.

Detection Guidance

Check OpenEMR versions before 8.5.0 for the file interface/patient_file/rules/patient_data.php. Monitor logs for unauthorized POST requests modifying clinical-rule records with global form_entryID values. Test with a read-only account to see if it can overwrite completion dates or states.

Impact Analysis

Attackers with limited access could falsify clinical actions, timestamps, and results. This may influence medical decisions by altering records, including cross-patient data in multi-patient environments like sports squads.

Mitigation Strategies

Upgrade OpenEMR to version 8.5.0 or later. Ensure write permissions are required for clinical-rule updates. Enforce patient ID verification in update predicates to prevent cross-patient data changes. Restrict read-only users from modifying records outside their assigned group.

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