---
id: CVE-2026-34361
title: >-
  HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare
  interoperability in Java
summary: >-
  HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare
  interoperability in Java. Prior to version 6.9.4, the FHIR Validator HTTP
  service exposes an unauthenticated "/loadIG" endpoint that makes outbound HTTP
  reque…
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N'
cwe:
  - CWE-552
vendor: hapifhir
product: hl7_fhir_core
affected:
  - hl7_fhir_core < 6.9.4
patched:
  - hl7_fhir_core 6.9.4
published: '2026-03-31'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34361'
references:
  - url: >-
      https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-vr79-8m62-wh98
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00422
epssPercentile: 0.33832
ingestedAt: '2026-07-24T20:38:02.923Z'
---

## Overview

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.4, the FHIR Validator HTTP service exposes an unauthenticated "/loadIG" endpoint that makes outbound HTTP requests to attacker-controlled URLs. Combined with a startsWith() URL prefix matching flaw in the credential provider (ManagedWebAccessUtils.getServer()), an attacker can steal authentication tokens (Bearer, Basic, API keys) configured for legitimate FHIR servers by registering a domain that prefix-matches a configured server URL. This issue has been patched in version 6.9.4.

## Affected

- `hl7_fhir_core < 6.9.4`

## Remediation

Upgrade past the affected range:

- `hl7_fhir_core 6.9.4`