Cross-site Scripting in HAPI FHIR

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.1 · CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

• CVE-2019-12741: 1.27% estimated exploitation activity in the next 30 days; percentile 69.80 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

XSS exists in the HAPI FHIR testpage overlay module of the HAPI FHIR library before 3.8.0. The attack involves unsanitized HTTP parameters being output in a form page, allowing attackers to leak cookies and other sensitive information from ca/uhn/fhir/to/BaseController.java via a specially crafted URL. (This module is not generally used in production systems so the attack surface is expected to be low, but affected systems are recommended to upgrade immediately.)

Published by the source

7 Jun 2019, 20:56 UTC

Last modified by the source

1 Feb 2023, 05:02 UTC

Source last checked

26 Oct 2026, 16:05 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-52mh-p2m2-w625

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# Patch Next advisory brief: CVE-2019-12741

Advisory: Cross-site Scripting in HAPI FHIR
IDs: CVE-2019-12741, GHSA-52mh-p2m2-w625
Record: https://patchnext.com/advisories/cve-2019-12741 (revision 1, source checked 26 Oct 2026, 16:05 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: ca.uhn.hapi.fhir:hapi-fhir-base 3.8.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven ca.uhn.hapi.fhir:hapi-fhir-base: affected < 3.8.0; fixed in 3.8.0

## Suggested inspection (read-only)
- Maven ca.uhn.hapi.fhir:hapi-fhir-base: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on ca.uhn.hapi.fhir:hapi-fhir-base.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-52mh-p2m2-w625 (GitHub-reviewed advisory GHSA-52mh-p2m2-w625 lists affected ranges: Maven ca.uhn.hapi.fhir:hapi-fhir-base >=0 <3.8.0)

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