CVE-2026-34361
Unauthenticated /loadIG endpoint enables token theft via attacker-controlled URLs.
Is CVE-2026-34361 being exploited?
Not confirmed. CVE-2026-34361 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-34361?
CVE-2026-34361 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-34361?
Yes. A fix has been recorded for CVE-2026-34361. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-34361 affect?
CVE-2026-34361 affects HAPI FHIR (Java) <= 6.9.3, FHIR Validator HTTP service. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-34361?
Upgrade to 6.9.4+ to fix.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Token theft: attacker-controlled URLs fetched via /loadIG; steals Bearer/Basic/API keys through URL-prefix flaw.
Immediate action required
- affected< 6.9.4
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.