Reflected XSS in OpenEMR Application Module

Executive Summary

This is a reflected cross-site scripting (XSS) vulnerability in OpenEMR versions before 8.5.0. It occurs in the Application module's auto-suggest endpoint where the searchMode POST parameter is echoed unencoded into a single-quoted onClick attribute. Attackers can trick an authenticated user into submitting a malicious payload to execute arbitrary JavaScript in the user's session, potentially stealing session cookies or disclosing patient data.

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Detection Guidance

To detect this vulnerability, inspect network traffic for POST requests to the application/index/search endpoint with the searchMode parameter containing unencoded single quotes or JavaScript payloads. Check server logs for unusual auto-suggest responses echoing user input. Use tools like Burp Suite or OWASP ZAP to intercept and analyze requests.

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Impact Analysis

An attacker could steal your session cookies or access sensitive patient data if you are an authenticated OpenEMR user. The vulnerability allows arbitrary JavaScript execution in your session, which could lead to unauthorized data access or session hijacking. The impact depends on your role and the data you can access within OpenEMR.

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Compliance Impact

This vulnerability could lead to unauthorized access or disclosure of patient data, violating HIPAA's confidentiality requirements. GDPR compliance may also be affected if patient data is exposed without proper safeguards. The risk of data breaches increases, potentially resulting in legal penalties and reputational damage.

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Mitigation Strategies

Upgrade OpenEMR to version 8.5.0 or later immediately. If upgrading is not possible, apply input validation to restrict searchMode to known values and implement output encoding for HTML and JavaScript contexts. Ensure the session cookie has the HttpOnly flag set.

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