CVE-2026-55471
CRITICALHAPI FHIR: XXE in XsltUtilities.saxonTransform via unhardened Saxon TransformerFactory
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2f55-g35j-5jmf
X_Refsource_Misc x_refsource_misc
https://github.com/hapifhir/org.hl7.fhir.core/commit/01ca2ecdefec9b33204d2495fe78af8c0dc52298
X_Refsource_Misc x_refsource_misc
https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10
Scores
CVSS v3
9.1
EPSS
0.0038
EPSS Percentile
30.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-611
Status
published
Products (2)
hapifhir/hl7_fhir_core
< 6.9.10
hapifhir/org.hl7.fhir.core
< 6.9.10
Published
Jul 08, 2026
Tracked Since
Jul 09, 2026