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Vulnerabilities CVE-2026-40507

CVE-2026-40507

Medium
Open
TLP:CLEAR

OpenEMR < 8.3.0 Reflected XSS via templateHtml Parameter in Patient Portal

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Description

OpenEMR before 8.3.0 contains a reflected cross-site scripting vulnerability in the patient portal template import handler. The templateHtml GET parameter is reflected into the page response without sanitization. An attacker can craft a URL that executes arbitrary JavaScript in the browser of any authenticated user with Forms Administration permissions who visits the link, enabling session hijacking.

Details

CVSS Score
5.1
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Confidence
90%
Published
Aug 19, 2026
Last Modified
Aug 21, 2026
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