Is CVE-2026-34361 actively exploited?

No active exploitation of CVE-2026-34361 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34361 be exploited remotely?

Yes. CVE-2026-34361 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34361?

CVE-2026-34361 has a CVSS score of 9.3 (CRITICAL).

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CRITICAL

CVE-2026-34361

CWE-552Published: March 31, 2026· Updated: Apr 3, 2026

9.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34361 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 9.3.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.