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CVE-2026-34361

Hapifhir Hl7 Fhir Core vulnerability

9.3 CRITICALPublic exploitEPSS 0.42%
  1. Published31 Mar 2026

Description

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.4, the FHIR Validator HTTP service exposes an unauthenticated "/loadIG" endpoint that makes outbound HTTP requests to attacker-controlled URLs. Combined with a startsWith() URL prefix matching flaw in the credential provider (ManagedWebAccessUtils.getServer()), an attacker can steal authentication tokens (Bearer, Basic, API keys) configured for legitimate FHIR servers by registering a domain that prefix-matches a configured server URL. This issue has been patched in version 6.9.4.

CVSS 3.1 breakdown

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

Affected products

Hapifhir Hl7 Fhir Core< 6.9.4

Remediation

Fixed in
Hapifhir Hl7 Fhir Core≥ 6.9.4

References

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Frequently asked

Is CVE-2026-34361 being actively exploited?

CVE-2026-34361 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.42%.

How severe is CVE-2026-34361?

CVE-2026-34361 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2026-34361?

Affected products include Hapifhir Hl7 Fhir Core.

How do I fix CVE-2026-34361?

Upgrade affected software to a fixed version, for example Hapifhir Hl7 Fhir Core 6.9.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34361 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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