Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.18. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Helidon accessible data as well as unauthorized update, insert or delete access to some of Helidon accessible data. CVSS 3.1 Base Score 6.5 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-18T21:18:17.580Z",
  "pubdate": "2026-08-18T21:18:17.580Z",
  "executiveSummary": "An unauthenticated vulnerability exists within the Imperative Web Server component of Oracle Fusion Middleware Helidon version 3.2.18, posing significant risks to data confidentiality and integrity. The vulnerability allows remote attackers with network access via the HTTP protocol to compromise the targeted Helidon instance, achieving unauthorized read access to critical or fully accessible data alongside unauthorized write, insert, or delete capabilities against a subset of accessible data resources. Although categorized with a high impact on confidentiality and integrity, the exploitation complexity is assessed as high, requiring precise conditions or state handling by the adversary to successfully execute malicious operations. The attack vector is strictly network-based, requiring no prior user interaction or authentication privileges, thereby lowering the barrier for external threat actors targeting exposed endpoints. Successful exploitation directly undermines core security boundaries within the application layer, potentially exposing sensitive business logic and data stores managed by the vulnerable framework. Organizations utilizing the affected version must evaluate exposure levels and implement necessary defensive controls to mitigate potential unauthorized data manipulation and information disclosure risks.",
  "technicalDetails": "The vulnerability resides in the Imperative Web Server component of the Oracle Fusion Middleware Helidon product, specifically affecting version 3.2.18. The architectural flaw manifests within request processing or resource routing logic, where insufficient validation or improper access controls permit unauthorized interactions over the HTTP protocol. The root cause stems from a failure to adequately enforce security boundaries during request handling, allowing malicious or malformed inputs to bypass intended authorization checks.\nExploitation is conducted remotely over the network via HTTP without requiring any pre-existing authentication credentials or user interaction. However, the attack vector is characterized by a high attack complexity, implying that successful exploitation requires specific environmental conditions, race conditions, precise timing, or specialized payload structuring to induce the vulnerable state in the Imperative Web Server.\nThe attack flow proceeds as follows: First, an unauthenticated attacker crafts a specialized HTTP request designed to interact with vulnerable endpoints managed by the Helidon Imperative Web Server. Second, the adversary transmits the payload across the network to the exposed service port. Third, due to the high-complexity flaw in request handling or component state management, the server improperly processes the request, failing to restrict unauthorized access. Finally, the attacker achieves the post-exploitation impact, which includes unauthorized retrieval of critical data and complete access to all data accessible by Helidon, as well as unauthorized update, insert, or delete operations on a subset of the accessible data.\nThe impact is strictly bounded to confidentiality and integrity domains, leaving availability unaffected, meaning denial-of-service conditions are not directly triggered by this specific vector. The flaw exclusively impacts the specified version 3.2.18 of the Helidon product line."
}