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CVE-2026-73920 – Unauthenticated RCE-level Data Compromise – Oracle Helidon 4.5.0 (Imperative Web Se

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Summary

CVE-2026-73920 is a critical, easily exploitable vulnerability in the Imperative Web Server component of Oracle Helidon that allows an unauthenticated, network-based attacker to compromise the affected system over HTTP. Successful exploitation can result in unauthorized creation, deletion, or modification of data, complete unauthorized access to all data accessible by the component, and a partial denial-of-service condition. Oracle disclosed the flaw as part of its August 2026 Critical Patch Update (CPU), assigning it a CVSS v3.1 base score of 9.4 (Critical).

Technical details

  • Root cause: The flaw resides in Helidon’s Imperative Web Server component; Oracle’s advisory does not publish further technical/root-cause detail beyond the CVSS impact metrics and the affected component name.
  • Trigger conditions: The vulnerability is remotely exploitable over the HTTP protocol without requiring any authentication or user interaction, and Oracle rates it as "easily exploitable."
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), unchanged scope (S:U).
  • Impact: High confidentiality impact and high integrity impact (unauthorized data disclosure and data manipulation), with a low availability impact (partial denial of service).

Affected software

  • Oracle Helidon version 4.5.0 (Imperative Web Server component), as listed in Oracle’s August 2026 Critical Patch Update risk matrix.

Severity

  • CVSS v3.1 Base Score: 9.4 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Mitigation and recommended actions

  • Immediate: Apply the fixes provided in Oracle’s August 2026 Critical Patch Update for Helidon. Oracle states that patches released through the Critical Patch Update program should be applied as soon as possible, since this vulnerability may be remotely exploitable without authentication.
  • If immediate patching is not possible: Restrict network access to Helidon-based web services (e.g., via firewalls, network segmentation, or reverse proxies) to trusted hosts only, since the flaw is exploitable over HTTP with no authentication and Oracle notes it may affect environments even when the Helidon-based application does not itself expose additional attack surface.
  • Review Oracle’s Critical Patch Update advisory directly for the specific patch identifiers and any Helidon release notes that supersede the affected 4.5.0 baseline, and apply the update as part of standard patch management processes.

References

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