CVE-2026-126484
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Stored XSS in OpenEMR Patient Portal via Fee Sheet Comments

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
OpenEMR before 8.5.0 contains a stored cross-site scripting vulnerability in printed_fee_sheet.php that allows authenticated portal patients to inject script by setting unescaped appointment comments (pc_hometext). Attackers can submit HTML payloads via the form_comments field in add_edit_event_user.php that execute when staff open the patient's fee sheet, acting within the staff session.

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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-2026-126484
EUVD
EUVD-2026-124940

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

This is a stored cross-site scripting (XSS) vulnerability in OpenEMR versions before 8.5.0. It exists in printed_fee_sheet.php where authenticated portal patients can inject malicious scripts via unescaped appointment comments (pc_hometext). Attackers exploit this by submitting HTML payloads through the form_comments field in add_edit_event_user.php. When staff open the patient's fee sheet, the injected script executes within the staff's session.

Detection Guidance

Check OpenEMR versions before 8.5.0 for the presence of printed_fee_sheet.php and inspect appointment comments in add_edit_event_user.php for unescaped HTML payloads in the form_comments field.

Impact Analysis

If you are a staff member using OpenEMR before 8.5.0, this vulnerability allows attackers to steal session cookies, perform actions on your behalf, or redirect you to malicious sites. For patients, it could lead to unauthorized access to personal health information if staff accounts are compromised. The impact includes data theft, account takeover, and potential malware delivery.

Compliance Impact

This vulnerability likely violates HIPAA due to unauthorized access to protected health information (PHI) and insufficient input validation. GDPR compliance may also be affected if personal data of EU patients is exposed. Both regulations require strict access controls and data protection measures, which this vulnerability undermines by allowing script injection and potential data breaches.

Mitigation Strategies

Upgrade OpenEMR to version 8.5.0 or later to address the stored XSS vulnerability in printed_fee_sheet.php.

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