Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.1. Easily exploitable 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 6.5 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-18T21:18:23.117Z",
  "pubdate": "2026-08-18T21:18:23.117Z",
  "executiveSummary": "An easily exploitable security vulnerability has been identified within the Helidon product of Oracle Fusion Middleware, specifically targeting the Imperative Web Server component. This vulnerability affects version 4.5.1 and exposes the application to unauthenticated remote attackers interacting via the HTTP protocol.\nSuccessful exploitation of this vulnerability compromises the affected Helidon instance, granting unauthorized actors the ability to perform read, update, insert, and delete operations on a subset of accessible data. The underlying vulnerability impacts both data confidentiality and integrity, though availability remains unaffected.\nFrom a risk perspective, the absence of required authentication and privileges, combined with low attack complexity over network vectors, significantly lowers the barrier to entry for malicious actors. Attackers do not require prior access or user interaction to compromise the target system.\nOrganizations deploying the affected version must prioritize remediation through official vendor-supplied patches or updates to eliminate exposure to unauthorized data manipulation and information disclosure risks.",
  "technicalDetails": "The vulnerability resides in the Imperative Web Server component of Oracle Fusion Middleware Helidon version 4.5.1. The root cause stems from insufficient access controls or improper handling of incoming HTTP requests, which allows unauthenticated remote entities to bypass intended security boundaries.\nThe attack vector is network-based (AV:N), utilizing the standard HTTP protocol to interact with the vulnerable Helidon endpoint. The attack complexity is evaluated as low (AC:L), indicating that no specialized race conditions, memory corruption techniques, or complex pre-conditions are required to execute the attack successfully.\nRegarding attacker requirements, the vulnerability demands zero privileges (PR:N) and requires no user interaction (UI:N). The scope is unchanged (S:U), meaning the security context remains within the vulnerable Helidon application component rather than escalating across distinct security boundaries.\nThe step-by-step attack flow involves an unauthenticated remote attacker crafting a malicious HTTP request directed at the exposed Imperative Web Server component of Helidon 4.5.1. Upon reception, the vulnerable server processes the request without enforcing adequate authorization checks. This flaw permits the execution of unauthorized data manipulation operations—specifically inserting, updating, or deleting accessible records—as well as unauthorized data retrieval, manifesting as a partial compromise of confidentiality and integrity.\nPost-exploitation impact is characterized by the unauthorized exposure of sensitive data subsets and the unauthorized modification or destruction of application data states. The CVSS 3.1 vector string associated with this flaw is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N, resulting in a Base Score of 6.5 (Medium/High severity range depending on organizational risk appetite)."
}