How severe is CVE-2026-34359?

CVE-2026-34359 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-34359 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34359?

CVE-2026-34359 affects Hapifhir Hl7 Fhir Core. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34359?

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

Does CVE-2026-34359 have an EU (EUVD) identifier?

Yes. CVE-2026-34359 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17524.

When was CVE-2026-34359 published?

CVE-2026-34359 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34359

CVE-2026-34359 is a high-severity vulnerability in Hapifhir Hl7 Fhir Core with a CVSS 3.x base score of 7.4. 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-346.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17524
Weakness: CWE-346
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, ManagedWebAccessUtils.getServer() uses String.startsWith() to match request URLs against configured server URLs for authentication credential dispatch. Because configured server URLs (e.g., http://tx.fhir.org) lack a trailing slash or host boundary check, an attacker-controlled domain like http://tx.fhir.org.attacker.com matches the prefix and receives Bearer tokens, Basic auth credentials, or API keys when the HTTP client follows a redirect to that domain. This issue has been patched in version 6.9.4.

Frequently asked questions

What is CVE-2026-34359?: HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.4, ManagedWebAccessUtils.getServer() uses String.startsWith() to match request URLs against configured server URLs for authentication credential dispatch. Because configured server URLs (e.g., http://tx.fhir.org) lack a trailing slash or host boundary check, an attacker-controlled domain like http://tx.fhir.org.attacker.com matches the prefix and receives Bearer tokens, Basic auth credentials, or API keys when the HTTP client follows a redirect to that domain. This issue has been patched in version 6.9.4.
How severe is CVE-2026-34359?: CVE-2026-34359 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-34359 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34359?: CVE-2026-34359 affects Hapifhir Hl7 Fhir Core. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34359?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34359 have an EU (EUVD) identifier?: Yes. CVE-2026-34359 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17524.
When was CVE-2026-34359 published?: CVE-2026-34359 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-fgv2-4q4g-wc35

Affected products (1)

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

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