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CVE-2026-55471

Hapifhir Hl7 Fhir Core XML external entity (XXE)

9.1 CRITICALPublic exploitEPSS 0.57%
  1. Published8 Jul 2026

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Hapifhir Hl7 Fhir Core< 6.9.10

Remediation

Fixed in
Hapifhir Hl7 Fhir Core≥ 6.9.10

References

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Frequently asked

Is CVE-2026-55471 being actively exploited?

CVE-2026-55471 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.57%.

How severe is CVE-2026-55471?

CVE-2026-55471 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.57% probability of exploitation.

Which products are affected by CVE-2026-55471?

Affected products include Hapifhir Hl7 Fhir Core.

How do I fix CVE-2026-55471?

Upgrade affected software to a fixed version, for example Hapifhir Hl7 Fhir Core 6.9.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.