CVE-2026-34361

HAPI FHIR: Unauthenticated SSRF via /loadIG Chains with startsWith() Credential Leak for Authentication Token Theft

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

hapifhir · org.hl7.fhir.core

CVSS v3.1 NVD

9.3 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

EPSS

0.42% chance of exploitation in the next 30 days, 35th percentile

Published

2026-03-31

Proof-of-concept exploits (1)

• advisories/GHSA-vr79-8m62-wh98

Security advisories

• hapifhir/org.hl7.fhir.core/security/advisories/GHSA-vr79-8m62-wh98

References

• CVE Record
• NVD entry