What is CVE-2026-124464?

CVE-2026-124464 is a medium-severity vulnerability in Openemr, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-11-08.

How severe is CVE-2026-124464?

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

Auth bypass in Openemr

CVE-2026-124464

OpenEMR before 8.4.0 contains an authorization bypass vulnerability that allows patient-scoped SMART tokens to read other patients' questionnaire responses because FhirQuestionnaireResponseService does not implement IPatientCompartmentResourceService. Attackers holding a patient/QuestionnaireResponse.rs token can request responses by uuid or list the unfiltered bundle to obtain cross-patient clinical assessment answers.

Vulnerability class: IDOR (Insecure Direct Object Reference)

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

EPSS: 0.003 (19.8th percentile), scored 2026-11-10.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Openemr

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/openemr/openemr/security/advisories/GHSA-fmmr-p679-97fq (vendor-advisory)
www.vulncheck.com/advisories/openemr-before-8.4.0-fhir-patient-compartment-bypa… (third-party-advisory)

Frequently asked questions

What is CVE-2026-124464?: CVE-2026-124464 is a medium-severity vulnerability in Openemr, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-11-08.
How severe is CVE-2026-124464?: Medium severity. CVSS v3 base score is 6.5 out of 10.