CVE-2026-55471CWE-611

HAPI FHIR: XXE in XsltUtilities.saxonTransform via unhardened Saxon TransformerFactory

High · published July 8, 2026

CVSS v4.0
8.7
EPSS
1%
Percentile
46.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
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
EPSS
0.00569 · 46.4th percentile
Weakness
CWE-611 · Improper Restriction of XML External Entity Reference
Published
2026-07-08T21:28Z
EPSS history
Timeline
  • 08 JUL 21:28Z
    HAPI FHIR: XXE in XsltUtilities.saxonTransform via unhardened Saxon TransformerFactory
    cvelistv5