CVE-2026-55471

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.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/hapifhir/org.hl7.fhir.core/commit/01ca2ecdefec9b33204d2495fe78af8c0dc52298	Patch
https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10	Release Notes
https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2f55-g35j-5jmf	Exploit Third Party Advisory
https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2f55-g35j-5jmf	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:hapifhir:hl7_fhir_core:*:*:*:*:*:*:*:*

History

25 Oct 2026, 17:10

Type	Values Removed	Values Added
Summary		(es) HAPI FHIR es una implementación completa del estándar HL7 FHIR para la interoperabilidad sanitaria en Java. Antes de la versión 6.9.10, las sobrecargas de org.hl7.fhir.utilities.XsltUtilities saxonTransform(...) instanciaban un net.sf.saxon.TransformerFactoryImpl() sin restricciones de ACCESS_EXTERNAL_DTD o ACCESS_EXTERNAL_STYLESHEET, permitiendo a un atacante que controla o puede manipular el XML transformado desencadenar una inyección de entidad externa XML para la divulgación de archivos locales y XXE ciego o SSRF a URLs arbitrarias accesibles desde el host. Este problema está solucionado en la versión 6.9.10.

Information

Published : 2026-07-08 22:17

Updated : 2026-10-25 17:10

NVD link : CVE-2026-55471

Mitre link : CVE-2026-55471

CVE.ORG link : CVE-2026-55471

JSON object : View

Products Affected

hapifhir

hl7_fhir_core

CWE

CWE-611

Improper Restriction of XML External Entity Reference

{"id": "CVE-2026-55471", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55471", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-09T13:26:09.323278Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "LOW", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "hapifhir", "product": "org.hl7.fhir.core", "versions": [{"status": "affected", "version": "< 6.9.10"}]}]}], "published": "2026-07-08T22:17:15.520", "references": [{"url": "https://github.com/hapifhir/org.hl7.fhir.core/commit/01ca2ecdefec9b33204d2495fe78af8c0dc52298", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2f55-g35j-5jmf", "tags": ["Exploit", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2f55-g35j-5jmf", "tags": ["Exploit", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-611"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "HAPI FHIR es una implementaci\u00f3n completa del est\u00e1ndar HL7 FHIR para la interoperabilidad sanitaria en Java. Antes de la versi\u00f3n 6.9.10, las sobrecargas de org.hl7.fhir.utilities.XsltUtilities saxonTransform(...) instanciaban un net.sf.saxon.TransformerFactoryImpl() sin restricciones de ACCESS_EXTERNAL_DTD o ACCESS_EXTERNAL_STYLESHEET, permitiendo a un atacante que controla o puede manipular el XML transformado desencadenar una inyecci\u00f3n de entidad externa XML para la divulgaci\u00f3n de archivos locales y XXE ciego o SSRF a URLs arbitrarias accesibles desde el host. Este problema est\u00e1 solucionado en la versi\u00f3n 6.9.10."}], "lastModified": "2026-10-25T17:10:00.197", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:hapifhir:hl7_fhir_core:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3E4B3594-33AE-4658-963E-35A8E81B8145", "versionEndExcluding": "6.9.10"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}