CVE-2026-33303 MEDIUM

CVE-2026-33303: OpenEMR Vulnerable to Stored XSS via Unescaped portal_login_username in Credential Print View

Vendor Openemr
Product openemr
Weakness CWE-79 · XSS
Published March 19, 2026
Last update March 24, 2026

CVSS base score

5.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

OpenEMR is a free and open source electronic health records and medical practice management application. Versions prior to 8.0.0.2 are vulnerable to stored cross-site scripting (XSS) via unescaped `portal_login_username` in the portal credential print view. A patient portal user can set their login username to an XSS payload, which then executes in a clinic staff member's browser when they open the "Create Portal Login" page for that patient. This crosses from the patient session context into the staff/admin session context. Version 8.0.0.2 fixes the issue.

Key dates

02Disclosure timeline

March 19, 2026 CVE published
March 24, 2026 Record updated