CVE-2026-24908: OpenEMR SQL Injection Vulnerability

CVE-2026-24908 Overview

CVE-2026-24908 is a critical SQL injection vulnerability affecting OpenEMR, a free and open source electronic health records (EHR) and medical practice management application. The vulnerability exists in the Patient REST API endpoint and allows authenticated users with API access to execute arbitrary SQL queries through the _sort parameter. This flaw could lead to unauthorized database access, exposure of Protected Health Information (PHI), and credential compromise.

The issue arises when user-supplied sort field names are used in ORDER BY clauses without proper validation or identifier escaping. Given the sensitive nature of healthcare data managed by OpenEMR systems, this vulnerability presents significant risks for HIPAA compliance and patient privacy.

Critical Impact

Authenticated attackers can leverage this SQL injection flaw to access, modify, or exfiltrate sensitive patient health records, potentially compromising the entire healthcare database and violating regulatory compliance requirements.

Affected Products

• OpenEMR versions prior to 8.0.0

Discovery Timeline

• 2026-02-25 - CVE CVE-2026-24908 published to NVD
• 2026-02-26 - Last updated in NVD database

Technical Details for CVE-2026-24908

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) affects the Patient REST API endpoint in OpenEMR. The root cause lies in the improper handling of user input in the _sort parameter, which is directly incorporated into ORDER BY clauses without adequate sanitization or validation.

When processing patient search requests via the API, the application accepts a _sort parameter intended to control the ordering of results. However, the application fails to validate that the supplied value corresponds to a legitimate column name, nor does it properly escape the input as a SQL identifier. This allows an authenticated attacker with API access to inject malicious SQL statements that execute with the privileges of the database user configured for the OpenEMR application.

Healthcare applications like OpenEMR store highly sensitive information including patient demographics, medical histories, diagnoses, medications, and insurance details. Successful exploitation could result in the disclosure of PHI, modification of medical records, or extraction of user credentials stored in the database.

Root Cause

The vulnerability stems from insufficient input validation in the PatientService.php component. The application directly uses user-controlled input from the _sort parameter in SQL ORDER BY clauses without implementing a whitelist of allowed column names or properly escaping the input as a database identifier.

The security patch implements a whitelist approach by defining an ALLOWED_SORT_COLUMNS constant that explicitly enumerates which column names can be used for sorting, effectively preventing arbitrary SQL injection through this parameter.

Attack Vector

The attack requires network access and valid API credentials. An authenticated user with API access can craft malicious requests to the Patient REST API, embedding SQL injection payloads within the _sort parameter. Since the vulnerability exists in an ORDER BY clause, attackers can leverage techniques such as time-based blind SQL injection or error-based extraction to exfiltrate data from the database.

    public const TABLE_NAME = 'patient_data';
    private const PATIENT_HISTORY_TABLE = "patient_history";

+    /**
+     * Columns allowed for sorting in patient search API.
+     * This whitelist prevents SQL injection via the _sort parameter.
+     */
+    private const ALLOWED_SORT_COLUMNS = [
+        'id',
+        'pid',
+        'pubpid',
+        'title',
+        'fname',
+        'lname',
+        'mname',
+        'DOB',
+        'sex',
+        'street',
+        'city',
+        'state',
+        'postal_code',
+        'country_code',
+        'phone_home',
+        'phone_cell',
+        'phone_biz',
+        'email',
+        'status',
+        'date',
+        'regdate',
+        'last_updated',

Source: GitHub Commit Update

Detection Methods for CVE-2026-24908

Indicators of Compromise

• Unusual or malformed API requests to the Patient REST API endpoint containing suspicious _sort parameter values
• Database query logs showing SQL syntax errors or unexpected ORDER BY clause structures
• Anomalous API activity patterns from authenticated users, particularly bulk data access attempts
• Evidence of time-based delays in API responses indicating blind SQL injection attempts

Detection Strategies

• Monitor API access logs for requests containing SQL keywords or special characters in the _sort parameter
• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in REST API parameters
• Review database audit logs for unusual query patterns or unauthorized data access attempts
• Deploy runtime application self-protection (RASP) solutions to detect SQL injection in real-time

Monitoring Recommendations

• Enable comprehensive logging for all Patient REST API endpoint activity
• Configure alerting for API requests that trigger SQL errors or exceptions
• Monitor for unauthorized access to sensitive database tables containing PHI
• Track API authentication events and correlate with subsequent data access patterns

How to Mitigate CVE-2026-24908

Immediate Actions Required

• Upgrade OpenEMR to version 8.0.0 or later immediately
• Conduct a security audit of API access logs to identify potential exploitation attempts
• Review database access permissions and restrict API user privileges where possible
• Temporarily disable Patient REST API access if upgrade cannot be performed immediately

Patch Information

OpenEMR version 8.0.0 addresses this vulnerability by implementing a whitelist-based validation approach for the _sort parameter. The fix adds an ALLOWED_SORT_COLUMNS constant in PatientService.php that explicitly defines permitted column names for sorting operations, preventing arbitrary user input from being incorporated into SQL queries.

For patch details, see the GitHub Commit Update and the GitHub Security Advisory.

Workarounds

• Restrict API access to trusted IP addresses using network-level controls
• Implement additional input validation at the reverse proxy or WAF layer to filter malicious _sort parameter values
• Disable or limit access to the Patient REST API endpoint until the patch can be applied
• Apply principle of least privilege to the database user account used by OpenEMR

# Example: Restricting API access via Apache configuration
<Location "/apis/api/patient">
    Require ip 10.0.0.0/8
    Require ip 192.168.0.0/16
</Location>