XSS in Open-Emr Openemr
CVE-2026-33303
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.007 (49.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.007 · change: +0.004
Affected products
- Open-Emr Openemr
- Openemr — versions < 8.0.0.2
Weakness classification (CWE)
References
- github.com/openemr/openemr/security/advisories/GHSA-cp37-pmfx-5mhm (Exploit, Vendor Advisory)
- github.com/openemr/openemr/commit/c32139b5144b1c704015221520ad2f931e25f10d (Patch)
Frequently asked questions
- What is CVE-2026-33303?
- CVE-2026-33303 is a medium-severity vulnerability in Open-Emr Openemr, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-19.
- How severe is CVE-2026-33303?
- Medium severity. CVSS v3 base score is 5.4 out of 10.