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CVE-2026-71159 – Unauthorized Data Access/Modification – Oracle Helidon 3.2.18 (Imperative Web Serve

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Summary

CVE-2026-71159 is a high-severity vulnerability in the Imperative Web Server component of Oracle Helidon, part of Oracle Fusion Middleware. The flaw allows an unauthenticated, remote attacker with only HTTP network access to gain unauthorized access to critical data and perform unauthorized updates, inserts, or deletes of some accessible data. Oracle rates this an "easily exploitable" vulnerability with a CVSS 3.1 base score of 8.2 (High).

Technical details

  • Root cause: A flaw in Helidon’s Imperative Web Server component that fails to properly restrict access to data handled by 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 (remote), low attack complexity, no privileges required.
  • Impact: High confidentiality impact (unauthorized access to critical/all accessible Helidon data) and low integrity impact (unauthorized update, insert, or delete of some accessible data). No availability impact is reported.

Affected software

  • Oracle Helidon, version 3.2.18 (per the official CVE record, this is the specific version confirmed affected by CVE-2026-71159; Oracle’s August 2026 Critical Security Patch Update also references other nearby Helidon releases — 1.4.19, 1.4.20, 3.2.19, 3.2.20, 4.5.0, 4.5.1, and 4.5.3 — as part of the same advisory bundle for the product line).

Severity

  • CVSS v3.1 Base Score: 8.2 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Mitigation and recommended actions

  • Immediate: Apply the fixes provided in Oracle’s Critical Security Patch Update Advisory for August 2026, and upgrade affected Helidon deployments to a version outside the vulnerable range confirmed in that advisory. Oracle strongly recommends applying the update without delay, since this vulnerability may be remotely exploitable without authentication.
  • If immediate patching is not possible: Restrict network access to the Helidon Imperative Web Server to trusted hosts/networks only (e.g., via firewall rules or network segmentation), and monitor HTTP traffic to affected services for anomalous access patterns until the patch can be applied.

References

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