Executive Summary

This vulnerability exists in OpenEMR versions prior to 8.0.0.3 where several variables in the MedEx recall/reminder processing code are concatenated directly into SQL queries without proper parameterization or type casting.

This improper handling enables SQL injection attacks, allowing an attacker to manipulate the SQL queries executed by the application.

The issue was fixed in version 8.0.0.3 by applying a patch.

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Impact Analysis

This SQL injection vulnerability can have serious impacts including unauthorized access to sensitive data, data manipulation, and potential compromise of the integrity of the medical records managed by OpenEMR.

Given the CVSS score of 5.9 with high confidentiality and integrity impact, an attacker with high privileges could exploit this vulnerability to read or alter sensitive patient information.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade OpenEMR to version 8.0.0.3 or later, as this version contains a patch that fixes the SQL injection issue.

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Compliance Impact

CVE-2026-33909 is a moderate severity SQL injection vulnerability in OpenEMR that allows attackers with certain privileges to execute arbitrary SQL commands, potentially reading or modifying sensitive patient records.

Because OpenEMR is an electronic health records system, unauthorized access or modification of patient data due to this vulnerability could lead to violations of data protection regulations such as HIPAA and GDPR, which mandate the confidentiality and integrity of personal health information.

The vulnerability arises from improper input validation and lack of parameterization in SQL queries, which could be exploited to compromise sensitive health data, thereby impacting compliance with these standards.

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Detection Guidance

This vulnerability involves SQL injection in the MedEx recall/reminder processing component of OpenEMR versions prior to 8.0.0.3. Detection involves identifying if your OpenEMR instance is running a vulnerable version and if the MedEx module is enabled.

To detect potential exploitation or presence of this vulnerability on your system, you can:

• Check the OpenEMR version to confirm if it is older than 8.0.0.3.
• Verify if the MedEx module is enabled, as it is disabled by default.
• Review database entries in the medex_prefs table for suspicious or malformed values in the ME_facilities preference, which could indicate injection attempts.
• Monitor logs or network traffic for unusual SQL queries or unexpected API calls to the MedEx API that might indicate injection attempts or MITM attacks.

Specific commands or queries you might use include:

• SQL query to check OpenEMR version: SELECT version(); or check application version files.
• SQL query to inspect medex_prefs table for suspicious ME_facilities values: SELECT * FROM medex_prefs WHERE ME_facilities LIKE '%|%' OR ME_facilities REGEXP '[^0-9,]';
• Use network monitoring tools (e.g., tcpdump, Wireshark) to capture traffic to the MedEx API endpoint and analyze for suspicious payloads.
• Check application logs for errors or warnings related to MedEx processing or SQL errors indicating injection attempts.

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