What is CVE-2026-33303?

CVE-2026-33303 is a medium-severity vulnerability in 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.

XSS in 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 cred…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (6.8th percentile) — read the EPSS interpretation.

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.

Affected products

Openemr — versions < 8.0.0.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://github.com/openemr/openemr/security/advisories/GHSA-cp37-pmfx-5mhm (x_refsource_CONFIRM)
https://github.com/openemr/openemr/commit/c32139b5144b1c704015221520ad2f931e25f10d (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33303?: CVE-2026-33303 is a medium-severity vulnerability in 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.