Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Helidon accessible data as well as unauthorized read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.8",
  "pubDate": "2026-08-18T21:18:22.767Z",
  "pubdate": "2026-08-18T21:18:22.767Z",
  "executiveSummary": "An unauthenticated security vulnerability affects the Imperative Web Server component of Oracle Fusion Middleware within the Helidon product, specifically targeting version 4.5.1. This vulnerability presents an exploitation vector over the network via the HTTP protocol, allowing remote attackers with network access to interact with the system without prior authentication. The security flaw is categorized as difficult to exploit, requiring specific conditions or high complexity on the part of the attacker to achieve successful execution. Successful exploitation of this vulnerability yields unauthorized impacts to both data confidentiality and data integrity. Specifically, adversaries can gain unauthorized read access to a subset of Helidon accessible data, alongside unauthorized update, insert, or delete access to some of the accessible data within the application environment. The overall risk profile is defined by a CVSS 3.1 Base Score of 4.8, reflecting moderate severity due to the combination of partial confidentiality and integrity compromises without affecting system availability. Organizations deploying the affected version must evaluate their exposure to network-based HTTP requests targeting the Imperative Web Server and implement appropriate remediation strategies to prevent unauthorized data manipulation and disclosure.",
  "technicalDetails": "The vulnerability resides within the Imperative Web Server component of the Helidon product, impacting version 4.5.1. The root cause stems from insufficient access controls, input validation, or authorization checks implemented within the HTTP request handling logic of the Imperative Web Server. This architectural flaw allows remote threat actors to bypass intended security boundaries when interacting with endpoints exposed over the network using the HTTP protocol.\nExploitation of this vulnerability requires network access and is characterized as difficult to exploit, indicating that successful execution may depend on specific environmental configurations, precise request formatting, or race conditions. Because the vulnerability allows unauthenticated access, the attacker requires no prior credentials or low-level privileges to initiate the attack sequence. The attack vector is strictly network-based (AV:N), meaning no local system access is necessary for the initial payload delivery.\nThe step-by-step attack flow begins with an unauthenticated adversary transmitting a crafted HTTP request over the network to the vulnerable Imperative Web Server component of Helidon. Upon receipt, the underlying routing and request processing logic fails to properly validate the caller's authorization to access, modify, insert, or delete the targeted data subsets. Consequently, the application processes the malicious or unauthorized HTTP payload, granting the attacker the ability to execute unintended data operations.\nThe post-exploitation impact directly affects the CIA triad by compromising confidentiality and integrity (C:L/I:L), while leaving availability entirely unaffected (A:N). The confidentiality breach permits the unauthorized retrieval of sensitive information contained within a subset of Helidon accessible data. Simultaneously, the integrity breach enables the unauthorized modification, insertion, or deletion of specific data records managed by the application. Because the vulnerability lacks an availability impact, services remain operational during and after the exploitation attempt, which can delay detection by automated monitoring tools focused solely on system crashes or denial-of-service indicators."
}