Summaryinfo

A vulnerability identified as critical has been detected in hapifhir org.hl7.fhir.core up to 6.9.3. This affects an unknown function of the file /loadIG of the component HTTP Endpoint. The manipulation leads to server-side request forgery. This vulnerability is documented as CVE-2026-34360. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in hapifhir org.hl7.fhir.core up to 6.9.3 and classified as critical. This issue affects some unknown functionality of the file /loadIG of the component HTTP Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. The summary by CVE is:

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.4, the /loadIG HTTP endpoint in the FHIR Validator HTTP service accepts a user-supplied URL via JSON body and makes server-side HTTP requests to it without any hostname, scheme, or domain validation. An unauthenticated attacker with network access to the validator can probe internal network services, cloud metadata endpoints, and map network topology through error-based information leakage. With explore=true (the default for this code path), each request triggers multiple outbound HTTP calls, amplifying reconnaissance capability. This issue has been patched in version 6.9.4.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-34360 since 03/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 6.9.4 eliminates this vulnerability.

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Productinfo

Vendor

• hapifhir

Name

• org.hl7.fhir.core

Version

• 6.9.0
• 6.9.1
• 6.9.2
• 6.9.3

Website

• Product: https://github.com/hapifhir/org.hl7.fhir.core/

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