High 8.7HealthcarePublished Jul 8, 2026

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

Updated under an hour ago (2026-10-19 09:10 UTC)

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It affects hapifhir org.hl7.fhir.core and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.57%, higher than 46% of scored CVEs.

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Every CVE for hapifhir org.hl7.fhir.core

Exploited in the last 30 days

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: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-611
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.57% (percentile 46)
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

hapifhir org.hl7.fhir.core hapifhir:org.hl7.fhir.core (from the name)	before 6.9.10	CNA record
hapifhir hl7_fhir_core hapifhir:hl7_fhir_core	before 6.9.10	NVD

References

https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2f55-g35j-5jmfx-refsource-confirm, exploit, third-party-advisory
https://github.com/hapifhir/org.hl7.fhir.core/commit/01ca2ecdefec9b33204d2495fe78af8c0dc52298x-refsource-misc, patch
https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.10x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.