How severe is CVE-2026-34361?

CVE-2026-34361 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-34361 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34361?

CVE-2026-34361 affects Hapifhir Hl7 Fhir Core. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34361?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34361 have an EU (EUVD) identifier?

Yes. CVE-2026-34361 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17528.

When was CVE-2026-34361 published?

CVE-2026-34361 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34361

CVE-2026-34361 is a critical-severity vulnerability in Hapifhir Hl7 Fhir Core with a CVSS 3.x base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-552.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17528
Weakness: CWE-552
Affected product: Hapifhir Hl7 Fhir Core
Published: 2026-03-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-34361?: 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.
How severe is CVE-2026-34361?: CVE-2026-34361 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-34361 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34361?: CVE-2026-34361 affects Hapifhir Hl7 Fhir Core. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34361?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34361 have an EU (EUVD) identifier?: Yes. CVE-2026-34361 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17528.
When was CVE-2026-34361 published?: CVE-2026-34361 was published on 2026-03-31 and last updated on 2026-06-17.

References

https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-vr79-8m62-wh98

Affected products (1)

cpe:2.3:a:hapifhir:hl7_fhir_core:*:*:*:*:*:*:*:*

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