What is CVE-2026-124458?

CVE-2026-124458 is a medium-severity vulnerability in Openemr, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-11-08.

How severe is CVE-2026-124458?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Openemr

CVE-2026-124458

OpenEMR before 8.4.0 contains an authorization bypass vulnerability in the FHIR GET /fhir/Person/:uuid route that allows patient-portal users to read any staff member's demographics by bypassing compartment enforcement. Attackers holding a patient SMART token with patient/Person.read can harvest staff Person UUIDs from Appointment references to retrieve names, home addresses, phone numbers, and personal emails.

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/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-284 — Improper Access Control

References

GitHub Security Advisory (GHSA-ggpx-qgcr-w2gh) (vendor-advisory)
VulnCheck Advisory: OpenEMR before 8.4.0 FHIR Patient Compartment Bypass via Person Endpoint (third-party-advisory)

Frequently asked questions

What is CVE-2026-124458?: CVE-2026-124458 is a medium-severity vulnerability in Openemr, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-11-08.
How severe is CVE-2026-124458?: Medium severity. CVSS v3 base score is 6.5 out of 10.