CVE-2026-126464
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Server-Side Request Forgery in OpenEMR

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
OpenEMR before 8.5.0 contains a server-side request forgery vulnerability in PatientPortalPDFDocumentCreator::createPdfObject() that allows authenticated patients to make the server issue HTTP GET requests. Attackers can submit img src, inline style url(), or reinserted unpurified style blocks via the content parameter of portal/lib/doc_lib.php to probe internal ports and cloud metadata endpoints.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-126464
EUVD
EUVD-2026-124960

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
openemr openemr to 8.5.0 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

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Executive Summary

This is a Server-Side Request Forgery (SSRF) vulnerability in OpenEMR versions before 8.5.0. It allows authenticated patients to manipulate the server into making HTTP GET requests to arbitrary destinations by injecting malicious content like img src attributes or style URLs via the content parameter in portal/lib/doc_lib.php. The server then processes these requests, enabling probing of internal ports and cloud metadata endpoints.

Detection Guidance

To detect this SSRF vulnerability, monitor outbound HTTP requests from your OpenEMR server, especially those originating from the Patient Portal PDF generation process. Check logs for requests to internal IPs or cloud metadata endpoints (e.g., 169.254.169.254 for AWS). Use network tools like tcpdump or Wireshark to capture suspicious traffic.

Impact Analysis

An attacker could exploit this to probe internal network ports, check reachability of cloud metadata endpoints, or potentially reflect limited image content if valid images are returned. This could lead to information disclosure about internal systems or cloud infrastructure.

Mitigation Strategies

Upgrade OpenEMR to version 8.5.0 or later immediately. If upgrading is not possible, restrict HTMLPurifier to allow only data URIs, disable external resource fetching in mPDF, remove style tag reinsertion logic, and add restrictions to prevent mPDF from fetching remote content.

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