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 high privileged attacker with logon to the infrastructure where Helidon executes to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Helidon accessible data. CVSS 3.1 Base Score 4.4 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.4",
  "pubDate": "2026-08-18T21:18:20.393Z",
  "pubdate": "2026-08-18T21:18:20.393Z",
  "executiveSummary": "A vulnerability has been identified within the Helidon product of Oracle Fusion Middleware, specifically affecting the Imperative Web Server component in version 4.5.1. This security flaw is classified as an easily exploitable vulnerability that can lead to unauthorized access to critical data or complete access to all data accessible by the Helidon instance. The risk implication is centered on confidentiality degradation, receiving a CVSS 3.1 Base Score of 4.4 with a vector of CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N. Exploitation requires a high-privileged attacker who already possesses logon access to the underlying infrastructure where the Helidon application executes. Due to the local attack vector and low attack complexity, a threat actor with the requisite high privileges can compromise the confidentiality boundary of the Helidon runtime environment without requiring user interaction.",
  "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, insecure permission configurations, or mishandled local data exposure within the execution environment, which permits a locally authenticated actor with elevated privileges to bypass intended isolation boundaries. The attack vector is strictly local (AV:L), meaning the adversary must already have achieved interactive or programmatic logon access to the host infrastructure hosting the Helidon service. The attack complexity is evaluated as low (AC:L), requiring minimal technical hurdles for exploitation once the local foothold is established. However, the attack prerequisite dictates high privileges (PR:H), meaning the threat actor must possess administrative or similarly elevated rights on the underlying operating system or infrastructure to interact with the vulnerable component or its accessible assets. No user interaction (UI:N) is required to successfully execute the attack, and the scope remains unchanged (S:U). During the attack flow, the high-privileged malicious actor leverages their authorized infrastructure logon and elevated permissions to target the Helidon runtime environment or its associated local resources. By exploiting the underlying flaw within the Imperative Web Server component, the attacker successfully circumvents data access restrictions. The post-exploitation impact results in a high breach of confidentiality (C:H), granting the unauthorized entity access to critical enterprise data or comprehensive visibility into all data accessible by the Helidon application instance. Integrity (I:N) and Availability (A:N) metrics remain unaffected, as the primary impact vector is constrained to unauthorized data disclosure."
}