# CVE-2026-124467: OpenEMR before 8.4.0 Remote Code Execution via ESign LFI and fax upload

Status: published. Published: 2026-11-08. Updated: 2026-11-13.

OpenEMR before 8.4.0 contains a local file inclusion in the ESign router (library/ESign/Router.php), which passes the unsanitized module parameter into a require_once of '<module>/Controller.php', and the fax module's faxProcessUploads writes attacker-named files to a predictable temp path without extension checks. Authenticated attackers can upload a PHP file named Controller.php, then request interface/esign/index.php with a traversing module parameter to include it and execute arbitrary code.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- openemr / openemr: ≥ 0; < 8.4.0 (affected, semver); 8.4.0 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.46% as of 2026-11-12; percentile 40.60%

- SSVC: exploitation poc; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-22

## Exploit evidence

- exploit: https://github.com/openemr/openemr/security/advisories/GHSA-p4v7-crwp-qq7q (ADP: CISA-ADP)

## References

- https://github.com/openemr/openemr/security/advisories/GHSA-p4v7-crwp-qq7q (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/openemr-before-8.4.0-remote-code-execution-via-esign-lfi-and-fax-upload (CNA: VulnCheck; third-party-advisory)

- https://github.com/openemr/openemr/security/advisories/GHSA-p4v7-crwp-qq7q (ADP: CISA-ADP; exploit)

- https://github.com/openemr/openemr/security/advisories/GHSA-p4v7-crwp-qq7q (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/openemr-before-8.4.0-remote-code-execution-via-esign-lfi-and-fax-upload (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-124467; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-124467; retrieved 2026-11-11; source updated 2026-11-10

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-124467; retrieved 2026-11-13; source updated Not reported

Revision: a106fedfa9c4781b9897ba85c2fa6a767c3c6be723b9255e109ac9dff0ed583c

Canonical: https://y2.dev/cve/CVE-2026-124467

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