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CVE-2026-73922 – Unauthenticated Data Manipulation/Access – Oracle Helidon Imperative Web Server (v1

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Summary

CVE-2026-73922 is a critical, easily exploitable vulnerability in the Imperative Web Server component of Oracle Helidon, part of Oracle Fusion Middleware. The flaw allows an unauthenticated, remote attacker with network access via HTTP to compromise the affected Helidon deployment, resulting in unauthorized creation, deletion, or modification of critical data, as well as unauthorized read access to data accessible by the application. Oracle disclosed the issue as part of its August 2026 Critical Patch Update, assigning it a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: A flaw in Helidon’s Imperative Web Server component that allows an attacker to bypass access controls over HTTP; Oracle’s advisory does not disclose further implementation-level detail.
  • Trigger conditions: The vulnerability is reachable over the network via standard HTTP requests, requires no authentication, and needs no user interaction to exploit ("easily exploitable" per Oracle’s classification).
  • Attack vector: Network (AV:N) — an attacker only needs network connectivity to the exposed Helidon HTTP service; attack complexity is Low (AC:L) and no privileges are required (PR:N).
  • Impact: Successful exploitation yields high confidentiality impact (unauthorized access to all Helidon-accessible data) and high integrity impact (unauthorized creation, deletion, or modification of critical data). Availability is not affected (A:N); the vulnerability scope is unchanged (S:U).

Affected software

  • Oracle Helidon, version 1.4.19 (the version explicitly listed as vulnerable in the CVE record for CVE-2026-73922).
  • Note: Oracle’s August 2026 Critical Patch Update lists the broader Helidon product line — versions 1.4.19, 1.4.20, 3.2.18, 3.2.19, 3.2.20, 4.5.0, 4.5.1, and 4.5.3 — as receiving security patches in this cycle, though CVE-2026-73922 itself is specifically recorded against version 1.4.19.

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Apply the Oracle Critical Patch Update for August 2026 and upgrade affected Helidon deployments to a fixed release beyond 1.4.19 (e.g., 1.4.20 or later within the corresponding supported branch), per Oracle’s patch availability documentation for Helidon.
  • If immediate patching is not possible: Restrict network exposure of Helidon’s Imperative Web Server component — do not expose it directly to untrusted networks or the public internet, and place it behind a properly configured firewall, VPN, or access-controlled gateway until the patch can be applied.
  • Review logs for anomalous HTTP requests to Helidon-based services and monitor for unexpected data creation, deletion, or modification as a precaution while remediation is in progress.

References

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