CVE-2026-62293: HAPI FHIR: Stored XSS in scan report via unescaped IG and profile titles

Severity: medium (CVSS 5.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-07 · updated 2026-09-09
Weakness: CWE-20

Description

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.11, the hidden scan command concatenates attacker-controlled Implementation Guide titles, profile titles, and source references into scan.html without escaping in Scanner.java. As a result, a user who scans an attacker-supplied IG/profile and then opens or publishes the generated local/CI HTML report can trigger stored cross-site scripting, executing attacker-controlled JavaScript in the report's browser context. This issue is fixed in version 6.9.11.

Affected products

hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.validation: before 6.9.11
hapifhir ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli: before 6.9.11
hapifhir org.hl7.fhir.core: before 6.9.11

References

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