CVE-2026-126474
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Reflected XSS in OpenEMR ACL Module

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
OpenEMR before 8.5.0 contains a reflected cross-site scripting vulnerability in the ACL module that allows attackers to execute JavaScript in authenticated sessions via the module_id parameter. Attackers can deliver crafted acl/index or acl/acl links that inject unencoded input into inline script blocks, stealing non-HttpOnly session cookies and modifying ACL configuration.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-126474
EUVD
EUVD-2026-124950

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
openemr openemr to 8.5.0 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

OpenEMR before version 8.5.0 has a reflected cross-site scripting (XSS) vulnerability in the ACL module. This flaw allows attackers to inject malicious JavaScript code into authenticated user sessions by exploiting the module_id parameter. The injected script can execute in the context of the user's session, potentially stealing session cookies or altering ACL configurations.

Detection Guidance

To detect this vulnerability, inspect web server access logs for requests to acl/index or acl/acl with the module_id parameter containing JavaScript or encoded payloads. Check for unusual inline script blocks in responses from the ACL module.

Impact Analysis

If you use OpenEMR versions before 8.5.0, an attacker could trick you into clicking a malicious link. This could allow them to steal your session cookies, hijack your authenticated session, or modify access control settings. This could lead to unauthorized access to sensitive data or system functions.

Compliance Impact

This vulnerability could lead to unauthorized access to patient or sensitive data, violating confidentiality requirements in GDPR and HIPAA. If exploited, it may result in data breaches, triggering mandatory breach notifications and potential fines under these regulations.

Mitigation Strategies

Upgrade OpenEMR to version 8.5.0 or later. Apply input validation to sanitize the module_id parameter in the ACL module. Implement Content Security Policy (CSP) headers to mitigate XSS impact. Review and restrict ACL configurations to least privilege.

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