Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.0. 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": "2026-08-18T21:18:21.757Z",
  "pubdate": "2026-08-18T21:18:21.757Z",
  "executiveSummary": "An easily exploitable security vulnerability exists within the Helidon product of Oracle Fusion Middleware, specifically affecting the Imperative Web Server component in version 4.5.0.\nThe vulnerability allows an unauthenticated remote attacker with network access via HTTP to compromise the confidentiality and integrity of accessible data within the application.\nSuccessful exploitation of this flaw can lead to unauthorized read access to a subset of Helidon accessible data, as well as unauthorized update, insert, or delete access to some of the accessible data.\nThe risk implication is moderate to high depending on the sensitivity of the data managed by the Helidon instance, driven by the complete lack of required authentication, user interaction, or complex attack conditions.\nWith a CVSS 3.1 Base Score of 6.5 and a vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N, the attack complexity is low and can be executed entirely over the network layer.\nDefense strategies must focus on restricting network exposure and applying vendor-supplied patches or updates as soon as they become available.",
  "technicalDetails": "The vulnerability resides in the Imperative Web Server component of Oracle Helidon version 4.5.0, where improper input validation, access control enforcement, or request handling logic permits unauthorized data manipulation and retrieval.\nThe attack vector is network-based (AV:N), meaning an adversary does not require physical access or local system presence to initiate an attack; standard HTTP requests directed at the exposed web server endpoints are sufficient.\nAttack complexity is assessed as low (AC:L), indicating that the target lacks robust defensive mechanisms against this specific request manipulation or that the conditions required to exploit the flaw are easily reproducible by an attacker.\nNo privileges are required (PR:N) and no user interaction (UI:N) is necessary, allowing fully automated scripts or unauthenticated malicious actors to probe and exploit the endpoint directly.\nThe scope remains unchanged (S:U), as the vulnerability's impact is contained within the security authorization context of the affected Helidon application instance rather than expanding to underlying hypervisors or host operating systems.\nThe step-by-step attack flow begins with the malicious actor establishing an HTTP connection to the vulnerable Helidon Imperative Web Server component over the network.\nThe attacker crafts specific HTTP requests targeted at vulnerable resource endpoints, bypassing expected authorization boundaries due to flaws in how the web server processes incoming requests or validates access rights.\nUpon receipt of the malicious payload, the Imperative Web Server processes the request and improperly grants execution of unauthorized data operations.\nPost-exploitation impact includes the unauthorized reading of sensitive data subsets (C:L) and the unauthorized modification, insertion, or deletion of application data records (I:L), while availability (A:N) remains unaffected as denial-of-service conditions are not triggered by this specific vulnerability vector."
}