CVE-2026-34359 json
HAPI FHIR: Authentication Credential Leakage via Improper URL Prefix Matching on HTTP Redirect in HAPI FHIR Core
published 2026-03-30 7 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-17524 , GHSA-fgv2-4q4g-wc35
- cvss
- 7.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 5%
- 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, 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.
Patch / fix
- maven ca.uhn.hapi.fhir:org.hl7.fhir.core 6.9.4
- maven ca.uhn.hapi.fhir:org.hl7.fhir.utilities 6.9.4
- ca.uhn.hapi.fhir org.hl7.fhir.core 6.9.4
- hapifhir hl7_fhir_core 6.9.4
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.16% chance of exploitation in the next 30 days, higher than 5% 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-fgv2-4q4g-wc35 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVD | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | ca.uhn.hapi.fhir:org.hl7.fhir.core | <6.9.4 |
6.9.4 |
| maven | ca.uhn.hapi.fhir:org.hl7.fhir.utilities | <6.9.4 |
6.9.4 |
Affected products
- hapifhir org.hl7.fhir.core
Classification
- Weakness
-
- CWE-346 Origin Validation Error
References
-
github.com
/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-fgv2-4q4g-wc35
exploit, web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-34359
advisory
-
github.com
/hapifhir/org.hl7.fhir.core
package
Sources
- CVE List CVE-2026-34359
- GitHub Advisory GHSA-fgv2-4q4g-wc35
- NVD CVE-2026-34359
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.