What is CVE-2026-124451?

CVE-2026-124451 is a medium-severity vulnerability in Openemr, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2026-11-08.

How severe is CVE-2026-124451?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Openemr

CVE-2026-124451

OpenEMR before 8.4.0 contains an authorization bypass vulnerability in its SMART on FHIR implementation because checkUserHasAccessToPatient() in BearerTokenAuthorizationStrategy.php unconditionally returns true. Authenticated users or malicious SMART apps can manipulate token launch context to bind requests to arbitrary patient UUIDs, gaining unauthorized read/write access to other patients' FHIR resources.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Openemr

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

GitHub Security Advisory (GHSA-xjgw-qjm5-4mq6) (vendor-advisory)
VulnCheck Advisory: OpenEMR before 8.4.0 Authorization Bypass via checkUserHasAccessToPatient in SMART on FHIR (third-party-advisory)

Frequently asked questions

What is CVE-2026-124451?: CVE-2026-124451 is a medium-severity vulnerability in Openemr, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2026-11-08.
How severe is CVE-2026-124451?: Medium severity. CVSS v3 base score is 5.3 out of 10.