CVE-2026-124486 in OpenEMR
Summary
by MITRE • 11/08/2026
OpenEMR before 8.3.0 contains a missing authorization vulnerability in the classic document controller that allows low-privilege authenticated users to recategorize other patients' documents. Attackers can invoke move_action_process to move a document into a patients|demo category, then retrieve it with an empty patient_id to exfiltrate PHI and tamper with charts.
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Analysis
by VulDB Data Team • 11/08/2026
The vulnerability identified in OpenEMR versions prior to 8.3.0 represents a critical failure in access control mechanisms within the classic document controller module. This flaw is classified as a missing authorization issue, specifically falling under CWE-269 which denotes Improper Privilege Management. The core technical deficiency lies in the application's inability to properly validate whether an authenticated user possesses the necessary permissions to perform actions on resources belonging to other patients. Specifically, the function move_action_process fails to enforce strict ownership checks when processing document movement requests. This allows any low-privilege authenticated user, such as a standard medical staff member or even a compromised account with minimal access rights, to manipulate documents associated with arbitrary patient records rather than just those they are authorized to view.
The exploitation of this vulnerability involves a two-step process that leverages the application's document management features for malicious purposes. First, an attacker invokes the move_action_process endpoint to reclassify or move a target patient's document into a category such as patients|demo, which may have less restrictive viewing permissions or be more easily accessible within certain interface contexts. Following this manipulation, the attacker can retrieve the content of these documents by supplying an empty or null patient_id parameter in subsequent requests. This technique effectively bypasses standard row-level security controls that typically tie document visibility to a specific patient identifier associated with the user's session or role. By decoupling the document retrieval from strict patient ownership validation, the application inadvertently exposes sensitive data stored within those documents.
The operational impact of this vulnerability is severe due to the nature of the data handled by OpenEMR as an electronic health record system. The ability to exfiltrate Protected Health Information (PHI) constitutes a direct violation of privacy regulations such as HIPAA in the United States or GDPR in Europe, potentially leading to significant legal and financial repercussions for healthcare organizations using the software. Beyond confidentiality breaches, the capability to tamper with charts introduces risks to patient safety and data integrity. An attacker could alter medical histories, medication lists, or diagnostic notes, which may lead to incorrect clinical decisions if such tampered records are acted upon by other healthcare providers unaware of the unauthorized modifications. This dual threat to both confidentiality and integrity underscores the criticality of addressing this flaw promptly.
From a tactical perspective, this vulnerability aligns with MITRE ATT&CK techniques related to Collection via Local Network Sharing or Accessing Remote Systems, specifically focusing on data exfiltration from compromised systems where internal trust boundaries are exploited. The attack vector is primarily network-based but requires initial authentication, placing it within the category of authenticated attacks that leverage misconfigured access controls rather than traditional injection or buffer overflow exploits. Mitigation strategies must focus on immediate patching to version 8.3.0 or later, which includes fixes for these authorization checks. In environments where upgrading is not immediately feasible, administrators should implement strict network segmentation to limit access to the OpenEMR instance and enforce multi-factor authentication to reduce the risk of credential compromise that could lead to exploitation of this flaw. Additionally, auditing logs for unusual document movement activities or requests with empty patient identifiers can help in detecting potential attempts at exploiting this vulnerability before significant data loss occurs.