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CVE-2026-73939 – Unauthenticated Data Manipulation (Integrity) – Oracle Helidon 3.2.20 (Imperative W

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Summary

CVE-2026-73939 is an easily exploitable vulnerability in the Imperative Web Server component of Oracle Helidon 3.2.20 that allows an unauthenticated, remote attacker with network access via HTTP to perform unauthorized creation, deletion, or modification of critical data accessible to Helidon. The vulnerability carries a CVSS v3.1 base score of 8.6 (High), driven by the combination of no authentication requirement, low attack complexity, and a scope change that allows impact beyond Helidon itself.

Technical details

  • Root cause: A flaw in the Imperative Web Server component of Oracle Helidon that permits unauthorized manipulation of data without proper access control enforcement.
  • Trigger conditions: Exploitation requires only network access via HTTP to the exposed Helidon service; no valid credentials or user interaction are needed.
  • Attack vector: Network (AV:N), with low attack complexity (AC:L) and no privileges required (PR:N).
  • Impact: High integrity impact (I:H) — attackers can create, delete, or modify critical data accessible to the application. The CVSS scope is marked "Changed" (S:C), indicating the vulnerability can affect resources beyond the vulnerable Helidon component itself. Confidentiality and availability are not impacted (C:N, A:N).

Affected software

  • Oracle Helidon 3.2.20

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Mitigation and recommended actions

  • Immediate: Apply the fix provided by Oracle in the August 2026 Critical Security Patch Update. Organizations running Oracle Helidon 3.2.20 should upgrade to the version specified in Oracle’s advisory as soon as possible.
  • If patching cannot be performed immediately:
    • Restrict network access to Helidon-based services to trusted networks only, minimizing direct HTTP exposure to the internet.
    • Deploy Helidon services behind a properly configured reverse proxy, WAF, or API gateway that can filter and monitor inbound HTTP requests.
    • Monitor logs for unusual or unauthorized data creation/modification/deletion activity on affected services.
    • Prioritize remediation for internet-facing instances given the unauthenticated, network-based exploitability of this issue.

References

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