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CVE-2026-55471— HAPI FHIR: XXE in XsltUtilities.saxonTransform via unhardened Saxon TransformerFactory

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组织开源的一个Java编写的 HL7 FHIR API。 HAPI FHIR 6.9.10之前版本存在输入验证错误漏洞，该漏洞源于saxonTransform(...)方法初始化TransformerFactoryImpl时未限制外部访问，允许攻击者控制或篡改转换的XML触发XML外部实体注入，导致本地文件泄露和盲XXE或SSRF攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.38% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
hapifhir org.hl7.fhir.core < 6.9.10 affected
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I. Basic Information for CVE-2026-55471

Vulnerability Information
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Vulnerability Title
HAPI FHIR: XXE in XsltUtilities.saxonTransform via unhardened Saxon TransformerFactory
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 6.9.10, org.hl7.fhir.utilities.XsltUtilities saxonTransform(...) overloads instantiated a bare net.sf.saxon.TransformerFactoryImpl() without ACCESS_EXTERNAL_DTD or ACCESS_EXTERNAL_STYLESHEET restrictions, allowing an attacker who controls or can tamper with transformed XML to trigger XML External Entity injection for local file disclosure and blind XXE or SSRF to arbitrary URLs reachable from the host. This issue is fixed in version 6.9.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5
Vulnerability Title
HAPI FHIR 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HAPI FHIR是HAPI FHIR组织开源的一个Java编写的 HL7 FHIR API。 HAPI FHIR 6.9.10之前版本存在输入验证错误漏洞，该漏洞源于saxonTransform(...)方法初始化TransformerFactoryImpl时未限制外部访问，允许攻击者控制或篡改转换的XML触发XML外部实体注入，导致本地文件泄露和盲XXE或SSRF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 < 6.9.10 -

II. Public POCs for CVE-2026-55471

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III. Intelligence Information for CVE-2026-55471

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Patches & Fixes for CVE-2026-55471 (1)

Vendor Advisories for CVE-2026-55471 (1)

Vendor Pages for CVE-2026-55471 (1)

IV. Related Vulnerabilities

Same product: org.hl7.fhir.core
Same vendor: hapifhir
Same weakness: CWE-611

V. Comments for CVE-2026-55471

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