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CVE-2026-73930 – Unauthenticated RCE/Data Compromise – Oracle Helidon 4.5.3 (Imperative Web Server)

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Summary

CVE-2026-73930 is a critical, remotely exploitable vulnerability in the Imperative Web Server component of Oracle Helidon (part of Oracle Fusion Middleware), affecting version 4.5.3. The flaw allows an unauthenticated attacker with network access via HTTP to compromise the Helidon server, with a scope change that can affect data and services beyond Helidon itself. Oracle rates the issue 9.9 (Critical) on the CVSS v3.1 scale, reflecting trivial exploitability and severe potential impact.

Technical details

  • Root cause: A flaw in Helidon’s Imperative Web Server component that permits unauthenticated HTTP requests to compromise the server.
  • Trigger conditions: No authentication or user interaction is required; the attacker only needs network access to the exposed Helidon HTTP service.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Scope change (S:C) — successful exploitation can affect resources beyond the vulnerable component, enabling unauthorized creation, modification, or deletion of critical data (high integrity impact), unauthorized read access to a subset of accessible data (low confidentiality impact), and partial denial of service (low availability impact).

Affected software

  • Oracle Helidon version 4.5.3 (Oracle Fusion Middleware — Imperative Web Server component)

Severity

  • CVSS v3.1 Base Score: 9.9 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L

Mitigation and recommended actions

  • Immediate: Apply the fix issued by Oracle in the August 2026 Critical Security Patch Update (CSPU) for Helidon and upgrade affected deployments away from version 4.5.3 to a patched release per Oracle’s official advisory.
  • If immediate patching is not possible: Restrict network exposure of the Helidon Imperative Web Server (e.g., firewall rules, network segmentation, or placing the service behind an authenticated reverse proxy) to limit access to trusted sources only, and monitor HTTP access logs for anomalous or unauthenticated requests until the patch can be applied.
  • Review any internet-facing Helidon-based services in your environment, as this vulnerability is remotely exploitable without credentials and warrants priority remediation.

References

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