# CVE-2026-124459: OpenEMR before 8.3.0 Cross-Patient IDOR via Encounter Form Viewers and Save Handlers


- **Severity:** High 8.6 (`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`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 8 Nov 2026
- **Updated:** 12 Nov 2026
- **Also known as:** GHSA-3mg9-27fw-m9j6, GHSA-mxq4-6pmv-p59f

## What is CVE-2026-124459?

CVE-2026-124459 is a high-severity vulnerability in openemr, published on 8 Nov 2026. 

### Official description

OpenEMR before 8.3.0 contains an insecure direct object reference vulnerability in many encounter-form view and save endpoints that lack patient/encounter ownership checks. Authenticated clinical users can enumerate sequential form id values in requests such as soap/view.php and save.php to read and overwrite other patients' clinical records.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-124459?


## How do I fix CVE-2026-124459?

No fix has been published for CVE-2026-124459 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-124459 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-124459 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-124459 and fix it if it is affected.

What it is: CVE-2026-124459 is a high-severity vulnerability in openemr, published on 8 Nov 2026. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-124459 exists.

Affected product: openemr. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-124459/ (Markdown: https://insights.sbomify.com/CVE-2026-124459/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-124459
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-124459
- OSV: https://osv.dev/vulnerability/CVE-2026-124459

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-124459/
Summaries are generated and may contain mistakes; the official description above is the record.