Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.3. 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 and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 7.3 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.3",
  "pubDate": "2026-08-18T21:18:26.340Z",
  "pubdate": "2026-08-18T21:18:26.340Z",
  "executiveSummary": "An easily exploitable vulnerability exists within the Oracle Fusion Middleware Helidon product, specifically localized to the Imperative Web Server component in version 4.5.3. This vulnerability can be leveraged remotely by unauthenticated threat actors over the HTTP protocol without requiring user interaction, presenting significant risk to enterprise deployments utilizing the affected framework. Successful exploitation compromises the CIA triad by granting unauthorized read access to a subset of Helidon accessible data, unauthorized update, insert, or delete capabilities against accessible data repositories, and the ability to induce a partial denial of service (partial DOS) condition against the Helidon runtime. Given the network accessibility and lack of authentication requirements, the attack surface is broad, enabling malicious actors to disrupt operational integrity, compromise data confidentiality, and manipulate application state. The CVSS 3.1 base score of 7.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) underscores the severity of this network-vector flaw, necessitating immediate defensive prioritization and remediation planning to prevent adversarial exploitation of the exposed endpoints.",
  "technicalDetails": "The vulnerability resides within the Imperative Web Server component of the Oracle Fusion Middleware Helidon product, specifically impacting version 4.5.3. The root cause stems from insufficient validation, access controls, or request handling logic within the HTTP request processing pipeline of the server implementation. Because the vulnerability is exposed via the network vector (AV:N) with low attack complexity (AC:L), an unauthenticated attacker (PR:N) requiring no user interaction (UI:N) can directly interact with the exposed HTTP interfaces to trigger the underlying flaw. The attack flow begins when an external adversary crafts malicious HTTP requests directed at vulnerable endpoints handled by the Helidon Imperative Web Server. Upon receipt, the affected component fails to properly enforce authorization boundaries or sanitize inputs, leading to improper handling of the transaction. This programmatic failure allows the injected payload or unauthorized command sequence to execute within the context of the application server. The post-exploitation impact spans multiple security domains: confidentiality is breached through unauthorized data retrieval of a subset of accessible application data; integrity is compromised via unauthorized data manipulation (update, insert, and delete operations); and availability is degraded, resulting in a partial denial of service (partial DOS) that impairs normal service delivery and resource utilization. The scope remains unchanged (S:U), as the impact is confined to the vulnerable Helidon component itself rather than breaching underlying host hypervisors or external resource boundaries. Due to the lack of pre-existing authentication requirements and the ubiquity of HTTP-based communication channels, any system exposing version 4.5.3 of the Helidon Imperative Web Server directly to untrusted networks remains immediately susceptible to remote exploitation."
}