CVE-2026-33911
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
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Description
OpenEMR is a free and open source electronic health records and medical practice management application. Prior to version 8.0.0.3, the POST parameter `title` is reflected back in a JSON response built with `json_encode()`. Because the response is served with a `text/html` Content-Type, the browser interprets injected HTML/script tags rather than treating the output as JSON. An authenticated attacker can craft a request that executes arbitrary JavaScript in a victim's session. Version 8.0.0.3 contains a fix.
Analysis
This is a stored/reflected cross-site scripting (XSS) vulnerability in OpenEMR versions prior to 8.0.0.3 where the POST parameter 'title' is improperly encoded in JSON responses but served with a text/html Content-Type header, causing browsers to execute injected JavaScript rather than treat the output as data. An authenticated attacker can craft a malicious request to execute arbitrary JavaScript in a victim's session, potentially leading to session hijacking, credential theft, or unauthorized actions within the electronic health records system. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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