---
id: "CVE-2026-126490"
page: "https://infrastack.ai/live/CVE-2026-126490"
kind: "vulnerability"
aliases: ["CVE-2026-126490"]
title: "OpenEMR: leftover debug code reveals web server Unix group memberships"
severity: "low"
cvss: 3.1
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "OpenEMR", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["healthcare", "openemr", "other", "php", "self-hosted"]
not_affected_if: ["no-fax-module-access", "openemr-8.5.0-or-later"]
published_at: "2026-11-13T10:17:59+00:00"
first_seen_at: "2026-11-13T10:47:26+00:00"
updated_at: "2026-11-13T10:58:59+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126490", "first_seen_at": "2026-11-13T10:47:26+00:00"}]
exploit_sources: []
---

# OpenEMR: leftover debug code reveals web server Unix group memberships

Link for people: https://infrastack.ai/live/CVE-2026-126490 (this .md is for agents)

OpenEMR versions before 8.5.0 contain debug code in the fax viewer that runs a system command and displays the web server's Unix group memberships. An attacker with fax module access can learn groups such as adm or shadow, which helps plan privilege escalation.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:OpenEMR affected range not listed fixed no fixed version listed

## How to check

- Check the OpenEMR version in the installed application; versions before `8.5.0` are affected.
- Look for `passthru("groups")` in `interface/fax/fax_view.php`.

## Fix

- OpenEMR: upgrade to `8.5.0` or later.

## Timeline

- 2026-11-13T10:47:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126490

## Documents

- [advisory] Vendor advisory: github.com https://github.com/openemr/openemr/security/advisories/GHSA-wc2f-fvpv-c32r
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/openemr-before-8.5.0-information-disclosure-via-debug-code-in-fax-view-php

## From the sources

OpenEMR before 8.5.0 contains active debug code in interface/fax/fax_view.php that executes passthru("groups") and discloses the web server's Unix group memberships. Authenticated attackers with fax module access can supply a nonexistent jid value to reveal groups such as adm or shadow, aiding privilege escalation planning.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_