Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.18. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in takeover of Helidon. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-18T21:18:07.503Z",
  "pubdate": "2026-08-18T21:18:07.503Z",
  "executiveSummary": "An easily exploitable vulnerability exists within the Imperative Web Server component of Oracle Fusion Middleware Helidon version 3.2.18, posing severe risks to organizational infrastructure. This flaw allows an unauthenticated remote attacker with network access via the HTTP protocol to fully compromise the affected application server. Successful exploitation results in a complete system takeover, yielding maximum severity impacts across confidentiality, integrity, and availability. The vulnerability is characterized by a CVSS 3.1 base score of 9.8, reflecting the critical nature of the exposure due to the lack of required authentication, user interaction, or complex attack conditions. Risk implications include unauthorized access to sensitive data, modification or destruction of critical system resources, and total denial of service. The attack vector is entirely network-based, enabling threat actors to target exposed Helidon instances directly without prior privileges or internal network positioning.",
  "technicalDetails": "The vulnerability resides in the Imperative Web Server component of Oracle Helidon version 3.2.18. The root cause stems from insufficient security controls or improper input handling within the HTTP request processing pipeline of the server, allowing malicious payloads to bypass intended security boundaries. Exploitation occurs remotely over the network via standard HTTP protocols without requiring any pre-existing authentication or user interaction. An unauthenticated attacker crafts a specialized HTTP request designed to exploit the underlying weakness in the Imperative Web Server component. Upon transmission to the vulnerable endpoint, the application processes the malicious payload, leading to unauthorized code execution or administrative control assertion. Because the attack vector relies purely on low-complexity network interactions, threat actors can automate the delivery of the exploit payload against exposed instances of Helidon 3.2.18. The post-exploitation impact is catastrophic, resulting in a full takeover of the Helidon runtime environment. An attacker achieving successful exploitation gains the ability to execute arbitrary commands, access confidential application data, manipulate internal application state, and disrupt service availability, effectively compromising the host system running the affected Oracle Fusion Middleware component."
}