Origin Validation Error Affecting ca.uhn.hapi.fhir:org.hl7.fhir.utilities package, versions [6.4.1,6.9.4)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published31 Mar 2026
- disclosed30 Mar 2026
- creditoffset
Introduced: 30 Mar 2026
CVE-2026-34359 (opens in a new tab)How to fix?
Upgrade ca.uhn.hapi.fhir:org.hl7.fhir.utilities to version 6.9.4 or higher.
Overview
Affected versions of this package are vulnerable to Origin Validation Error in the ManagedWebAccessUtils.getServer function. An attacker can obtain authentication credentials by leveraging improper URL prefix matching during HTTP redirects, causing sensitive headers such as Bearer tokens, Basic auth credentials, or API keys to be sent to attacker-controlled domains. This can be exploited when the HTTP client follows redirects to URLs that maliciously match the configured server prefix without proper host boundary validation.
Note: A partial fix was implemented in version 6.9.3, with a more complete solution implemented when addressing isLocal in 6.9.4