Vulnerabilities
Vulnerable Software

Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 22.9%
CVSS Severity
CVSS v3 Score 9.1
Products affected by CVE-2026-55471


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