CVE-2026-34361Public exploitNetwork attack vector

Credential theft via prefix-matched SSRF requests

Published Mar 31, 2026 · Updated Mar 31, 2026

SSRF in the HAPI FHIR Validator HTTP service before 6.9.4 allows remote attackers to steal configured server credentials via /loadIG. The unauthenticated handler passes the ig value directly to IgLoader, while ManagedWebAccessUtils.getServer uses startsWith() on the destination URL and attaches matching credentials. Exploitation requires a configured FHIR server credential and an attacker-controlled prefix-matching domain or redirect, exposing Bearer tokens, Basic credentials, or API keys.

CVSS severity9.3
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in the HAPI FHIR Validator HTTP service before 6.9.4 allows remote attackers to steal configured server credentials via /loadIG. The unauthenticated handler passes the ig value directly to IgLoader, while ManagedWebAccessUtils.getServer uses startsWith() on the destination URL and attaches matching credentials. Exploitation requires a configured FHIR server credential and an attacker-controlled prefix-matching domain or redirect, exposing Bearer tokens, Basic credentials, or API keys.

The record

CVE
CVE-2026-34361
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
HAPI FHIR
Product
org.hl7.fhir.core
Classifications
CWE-552, CWE-522, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HAPI FHIR · org.hl7.fhir.coreversion=< 6.9.4

Published CVSS scores

9.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-552Files or Directories Accessible to External Parties
CWE-522Insufficiently Protected Credentials
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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