CVE-2026-126467
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Mass Assignment in OpenEMR Leading to Unauthorized Data Modification

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
OpenEMR before 8.5.0 contains a mass assignment vulnerability in ObservationController::processEnhancedFormSave() that allows authenticated low-privilege users to forge authorization flags through an incomplete field blacklist. Attackers can submit authorized=1 or override the id field alongside observation_id to mark observations as Provider-signed and overwrite clinical fields of other observations within the same patient encounter.

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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-2026-126467
EUVD
EUVD-2026-124957

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-915 The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.

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Executive Summary

CVE-2026-126467 is a mass assignment vulnerability in OpenEMR versions before 8.5.0. It occurs in the ObservationController::processEnhancedFormSave() function due to an incomplete field blacklist that fails to block critical fields like authorized, id, uuid, and parent_observation_id. This allows authenticated low-privilege users to forge authorization flags or tamper with clinical data by submitting manipulated POST fields.

Detection Guidance

To detect this vulnerability, inspect OpenEMR installations for versions prior to 8.5.0. Check for unauthorized modifications to observation records by reviewing database logs for POST requests containing parameters like authorized=1, id, or observation_id. Look for changes in the authorized flag or clinical field values in the observations table.

Impact Analysis

An attacker with low privileges could mark their own observations as Provider-signed by submitting authorized=1, undermining trust in billing and reports. They could also overwrite clinical fields in other observations within the same patient encounter by manipulating the id and observation_id fields, potentially altering critical medical data.

Compliance Impact

This vulnerability compromises data integrity and authorization trust, which are critical for compliance with GDPR (accuracy of personal data) and HIPAA (integrity and security of protected health information). Unauthorized modifications to clinical data could lead to violations of these regulations.

Mitigation Strategies

Immediately upgrade OpenEMR to version 8.5.0 or later. If upgrading is not possible, apply a patch that replaces the blacklist with an explicit allow-list of user-settable fields and derives the authorized flag from server-side session data. Restrict low-privilege user access to sensitive endpoints until mitigation is complete.

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