Unauthenticated, network-accessible exploit in Oracle Helidon (widely used Oracle product) with CVSS 9.9 allowing data tampering and service impact; broad enterprise reach.
CVE-2026-73930
Unauthenticated HTTP vuln in Oracle Helidon 4.5.3 enabling data tamper and partial DoS.
Is CVE-2026-73930 being exploited?
Not confirmed. CVE-2026-73930 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 0.38% probability of exploitation in the next 30 days.
How severe is CVE-2026-73930?
CVE-2026-73930 is rated Critical with a CVSS score of 9.9. 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-2026-73930?
Yes. A fix has been recorded for CVE-2026-73930. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73930 affect?
CVE-2026-73930 affects Oracle Helidon 4.5.3, Oracle Fusion Middleware (Helidon component), Imperative Web Server, Helidon-based applications. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73930?
Apply vendor patch when released; restrict HTTP access and deploy WAF rules
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated attackers can create/modify/delete Helidon-accessible data, read some data, and cause partial DoS.
Immediate action required
- affected>= 3.0.0 and <= 3.2.19
- affected>= 4.0.0 and <= 4.5.2
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.