Cross-site Scripting (XSS) - Reflected in openemr/openemr

This XSS vulnerability allows an attacker to inject arbitrary JavaScript code into the context of a user's browser session within OpenEMR. An attacker could craft a malicious URL containing the XSS payload and trick a user into clicking it. Upon visiting the crafted URL, the injected script would execute, potentially stealing session cookies, redirecting the user to a phishing site, or modifying the content of the page. The impact is significant, as it can compromise user accounts and potentially lead to data breaches or unauthorized access to sensitive patient information. This vulnerability is particularly concerning given OpenEMR's use in healthcare settings where patient data privacy is paramount.

Healthcare providers and organizations utilizing OpenEMR versions 7.0.0.1 and earlier are at significant risk. This includes clinics, hospitals, and individual practitioners who rely on OpenEMR for electronic health record management. Shared hosting environments where multiple OpenEMR instances reside on the same server are particularly vulnerable, as a compromise of one instance could potentially impact others.

• php: Examine access logs for unusual URL parameters containing JavaScript code. Use grep to search for patterns like <script> or javascript: within the logs.

grep -i 'javascript:|\<script' /var/log/apache2/access.log

• generic web: Use curl to test potentially vulnerable endpoints with simple XSS payloads (e.g., <script>alert(1)</script>). Inspect the response for the presence of the payload in the HTML output.

curl -X GET 'https://openemr.example.com/vulnerable_page?param=<script>alert(1)</script>' | grep 'alert(1)'

1. 2022-08-09Disclosure

   disclosure

1. 予約済み2022-08-09
2. 公開日2022-08-09
3. 更新日2024-08-03
4. EPSS 更新日2026-04-02

The primary mitigation for CVE-2022-2733 is to immediately upgrade OpenEMR to version 7.0.0.1 or later. If upgrading is not immediately feasible, consider implementing input validation and output encoding on all user-supplied data to prevent the injection of malicious scripts. Web Application Firewalls (WAFs) configured with rules to detect and block XSS payloads can also provide a temporary layer of protection. Regularly review and update OpenEMR's security configuration to minimize the attack surface. After upgrading, confirm the vulnerability is resolved by attempting to inject a simple XSS payload through a vulnerable endpoint and verifying that it is properly sanitized.