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. While the vulnerability is in Helidon, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Helidon accessible data as well as unauthorized update, insert or delete access to some of Helidon accessible data. CVSS 3.1 Base Score 9.3 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.3",
  "pubDate": "2026-08-18T21:18:06.430Z",
  "pubdate": "2026-08-18T21:18:06.430Z",
  "executiveSummary": "An easily exploitable vulnerability exists within the Imperative Web Server component of the Helidon product, part of Oracle Fusion Middleware, specifically affecting version 3.2.18. This security flaw allows unauthenticated remote attackers with network access via HTTP to compromise the Helidon environment. Due to the architectural scope change associated with the vulnerability, successful exploitation can result in significant security implications extending beyond Helidon to impact additional integrated products. The attack vector is completely network-based and requires no user interaction, low attack complexity, and zero prior privileges. The primary impacts include unauthorized access to critical data, complete access to all data accessible by Helidon, and unauthorized update, insert, or delete capabilities regarding a subset of Helidon-accessible data. Given the high CVSS 3.1 Base Score of 9.3, driven by severe confidentiality and integrity impacts, this vulnerability poses a critical risk to enterprise deployments relying on the affected software version, necessitating immediate remediation and defensive oversight.",
  "technicalDetails": "The vulnerability resides in the Imperative Web Server component of the Helidon product, affecting specifically supported version 3.2.18. The root cause stems from improper input validation, request handling, or access control enforcement within the HTTP processing pipeline of the Imperative Web Server. Attackers leverage network access via the HTTP protocol to interact directly with the vulnerable component without requiring any prior authentication or administrative privileges.\nThe attack flow begins when an unauthenticated remote attacker crafts a specialized HTTP request designed to exploit the processing flaw in the Helidon Imperative Web Server. Because the vulnerability requires low attack complexity and zero user interaction, the payload is transmitted directly over the network to the listening HTTP port of the target service. Upon receipt, the vulnerable component fails to properly sanitize or restrict the incoming request, allowing the attacker to bypass intended security boundaries.\nDue to the scope change (S:C) characteristic of this vulnerability, the exploit context extends past the immediate boundaries of the Helidon runtime environment, potentially impacting secondary or additional products integrated within the Oracle Fusion Middleware ecosystem. The payload behavior facilitates unauthorized read operations resulting in severe confidentiality breaches—including complete access to all data accessible by Helidon and unauthorized access to critical data. Additionally, the payload enables partial integrity violations, granting unauthorized update, insert, or delete access to a subset of Helidon-accessible data. The combination of complete confidentiality compromise and localized integrity degradation leads to an overall CVSS 3.1 Base Score of 9.3, represented by the vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N)."
}