CVE-2026-34361 json
HAPI FHIR: Unauthenticated SSRF via /loadIG Chains with startsWith() Credential Leak for Authentication Token Theft
published 2026-03-30 7 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-17528 , GHSA-vr79-8m62-wh98
- cvss
- 9.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 23%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven ca.uhn.hapi.fhir:org.hl7.fhir.validation 6.9.4
- ca.uhn.hapi.fhir org.hl7.fhir.validation 6.9.4
- hapifhir hl7_fhir_core 6.9.4
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-vr79-8m62-wh98 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N |
| GitHub | 3.1 | 9.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N |
| NVD | 3.1 | 9.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | ca.uhn.hapi.fhir:org.hl7.fhir.validation | <6.9.4 |
6.9.4 |
Affected products
- hapifhir org.hl7.fhir.core
Classification
References
-
github.com
/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-vr79-8m62-wh98
web, exploit, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-34361
advisory
-
github.com
/hapifhir/org.hl7.fhir.core
package
Sources
- CVE List CVE-2026-34361
- GitHub Advisory GHSA-vr79-8m62-wh98
- NVD CVE-2026-34361
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.