CVE-2026-33180: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in hapifhir org.hl7.fhir.core
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.0, when setting headers in HTTP requests, the internal HTTP client sends headers first to the host in the initial URL but also, if asked to follow redirects and a 30X HTTP response code is returned, to the host mentioned in URL in the Location: response header value. Sending the same set of headers to subsequent hosts is a problem as this header often contains privacy sensitive information or data that could allow others to impersonate the client's request. This issue has been patched in release 6.9.0. No known workarounds are available.
AI Analysis
Technical Summary
CVE-2026-33180 affects the HAPI FHIR Java implementation of the HL7 FHIR standard. Before version 6.9.0, when the internal HTTP client follows redirects (HTTP 30X responses), it sends the same HTTP headers—including potentially sensitive or authentication-related headers—to the redirected host specified in the Location header. This behavior can lead to exposure of sensitive information to unauthorized actors. The vulnerability is classified under CWE-200 (Exposure of Sensitive Information) and has a CVSS 3.1 base score of 7.5 (high severity). The issue was patched in release 6.9.0. According to the Red Hat advisory, no workarounds are available.
Potential Impact
The vulnerability allows sensitive HTTP headers, which may contain privacy-sensitive data or authentication tokens, to be sent to unintended hosts during HTTP redirects. This can result in unauthorized disclosure of sensitive information, potentially enabling attackers to impersonate the client or gain unauthorized access. The impact is confidentiality loss only, with no integrity or availability impact reported.
Mitigation Recommendations
Upgrade to HAPI FHIR version 6.9.0 or later, where this issue has been fixed. No known workarounds are available. Users should apply the official patch to prevent exposure of sensitive headers during HTTP redirects.
CVE-2026-33180: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in hapifhir org.hl7.fhir.core
Description
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.0, when setting headers in HTTP requests, the internal HTTP client sends headers first to the host in the initial URL but also, if asked to follow redirects and a 30X HTTP response code is returned, to the host mentioned in URL in the Location: response header value. Sending the same set of headers to subsequent hosts is a problem as this header often contains privacy sensitive information or data that could allow others to impersonate the client's request. This issue has been patched in release 6.9.0. No known workarounds are available.
CVSS v3.1
Score 7.5high
Affected software
pkg:maven/org.hl7.fhir.core/org.hl7.fhir.coreRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-33180 affects the HAPI FHIR Java implementation of the HL7 FHIR standard. Before version 6.9.0, when the internal HTTP client follows redirects (HTTP 30X responses), it sends the same HTTP headers—including potentially sensitive or authentication-related headers—to the redirected host specified in the Location header. This behavior can lead to exposure of sensitive information to unauthorized actors. The vulnerability is classified under CWE-200 (Exposure of Sensitive Information) and has a CVSS 3.1 base score of 7.5 (high severity). The issue was patched in release 6.9.0. According to the Red Hat advisory, no workarounds are available.
Potential Impact
The vulnerability allows sensitive HTTP headers, which may contain privacy-sensitive data or authentication tokens, to be sent to unintended hosts during HTTP redirects. This can result in unauthorized disclosure of sensitive information, potentially enabling attackers to impersonate the client or gain unauthorized access. The impact is confidentiality loss only, with no integrity or availability impact reported.
Mitigation Recommendations
Upgrade to HAPI FHIR version 6.9.0 or later, where this issue has been fixed. No known workarounds are available. Users should apply the official patch to prevent exposure of sensitive headers during HTTP redirects.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-17T22:16:36.720Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-33180","vendor":"Red Hat"}]
Threat ID: 69bdcad201d25e334c8cba8f
Added to database: 03/20/2026, 22:31:46 UTC
Last enriched: 07/15/2026, 08:57:43 UTC
Last updated: 08/01/2026, 19:17:59 UTC
Views: 196
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