CVE-2026-34361

critical · 9.3

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.

9.3

CVSS

0.3%

EPSS (exploit prob.)

23rd

EPSS percentile

2026-03-31

Published

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

Weaknesses

CWE-552

Affected products

Vendor	Product	Affected versions
hapifhir	hl7_fhir_core	< 6.9.4

Check a specific version with /api/v1/cve/match.

References

https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-vr79-8m62-wh98

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-34361