# CVE-2026-34361

## Summary

- **CVE ID:** CVE-2026-34361
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N)
- **CWE:** CWE-552
- **Published:** Mar 31, 2026
- **Last Modified:** Mar 31, 2026

## Description

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 Products

- hapifhir — org.hl7.fhir.core (< 6.9.4)

## References

- [CNA](https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-vr79-8m62-wh98)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._