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CVE-2026-34360— HAPI FHIR: Unauthenticated Blind SSRF via /loadIG Endpoint Enables Internal Network Probing

Quick assessment

Affected
hapifhir org.hl7.fhir.core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HAPI FHIR是HAPI FHIR开源的一个Java编写的 HL7 FHIR API。 HAPI FHIR 6.9.4之前版本存在代码问题漏洞，该漏洞源于FHIR Validator HTTP服务的/loadIG端点未验证用户提供的URL，可能导致服务端请求伪造攻击。

CVSS 5.8 · Medium EPSS 0.32% · P24
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I. Basic Information for CVE-2026-34360

Vulnerability Information
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Vulnerability Title
HAPI FHIR: Unauthenticated Blind SSRF via /loadIG Endpoint Enables Internal Network Probing
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
HAPI FHIR 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HAPI FHIR是HAPI FHIR开源的一个Java编写的 HL7 FHIR API。 HAPI FHIR 6.9.4之前版本存在代码问题漏洞，该漏洞源于FHIR Validator HTTP服务的/loadIG端点未验证用户提供的URL，可能导致服务端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hapifhir org.hl7.fhir.core < 6.9.4 -

II. Public POCs for CVE-2026-34360

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III. Intelligence Information for CVE-2026-34360

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Vendor Advisories for CVE-2026-34360 (1)

Same Patch Batch · hapifhir · 2026-03-31 · 3 CVEs total

CVE-2026-34361 9.3 CRITICAL HAPI FHIR: Unauthenticated SSRF via /loadIG Chains with startsWith() Credential Leak for A
CVE-2026-34359 7.4 HIGH HAPI FHIR: Authentication Credential Leakage via Improper URL Prefix Matching on HTTP Redi

IV. Related Vulnerabilities

Same product: org.hl7.fhir.core
Same vendor: hapifhir
Same weakness: CWE-918