EUVD-2026-278363

fkie_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.

GHSA-fgv2-4q4g-wc35 — HAPI FHIR Core has Authentication Credential Leakage via Improper URL Prefix Matching on HTTP Redirect

Affected: Maven: ca.uhn.hapi.fhir:org.hl7.fhir.core, Maven: ca.uhn.hapi.fhir:org.hl7.fhir.utilities

## Summary

`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.

## Details

The root cause is in `ManagedWebAccessUtils.getServer()` at `org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/http/ManagedWebAccessUtils.java:26`:

```java public static ServerDetailsPOJO getServer(String url, Iterable<ServerDetailsPOJO> serverAuthDetails) { if (serverAuthDetails != null) { for (ServerDetailsPOJO serverDetails : serverAuthDetails) { if (url.startsWith(serverDetails.getUrl())) { // <-- no host boundary check return serverDetails; } } } return null; } ```

The configured production terminology server URL is defined without a trailing slash in `FhirSettingsPOJO.java:19`:

```java protected static final String TX_SERVER_PROD = "http://tx.fhir.org"; ```

This means: - `"http://tx.fhir.org.attacker.com/capture".startsWith("http://tx.fhir.org")` → **true** - `"http://tx.fhir.org:8080/evil".startsWith("http://tx.fhir.org")` → **true**

**Exploit chain via SimpleHTTPClient (redirect path):**

1. `SimpleHTTPClient.g…

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EUVD-2026-278363

fkie_cve-2026-34359

GHSA-fgv2-4q4g-wc35 — HAPI FHIR Core has Authentication Credential Leakage via Improper URL Prefix Matching on HTTP Redirect