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. While the vulnerability is in Helidon, attacks may significantly impact additional products (scope change). 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 6.8 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.8",
  "pubDate": "2026-08-18T21:18:02.493Z",
  "pubdate": "2026-08-18T21:18:02.493Z",
  "executiveSummary": "An unauthenticated vulnerability exists within the Imperative Web Server component of Oracle Fusion Middleware Helidon version 3.2.18, posing significant security risks to enterprise deployments.\nThe flaw allows remote attackers with network access via the HTTP protocol to compromise the affected Helidon instance and achieve unauthorized access to critical data or complete access to all Helidon-accessible data.\nAccording to the CVSS 3.1 vector (AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N), the vulnerability is classified with a base score of 6.8, primarily impacting data confidentiality while introducing a scope change that may severely affect additional downstream products or integrated systems.\nAlthough exploitation is categorized as difficult and requires high attack complexity, successful exploitation does not require user interaction or prior authentication, making it a critical concern for perimeter defenses exposed to untrusted networks.",
  "technicalDetails": "The vulnerability resides in the Imperative Web Server component of Oracle Fusion Middleware Helidon, specifically affecting version 3.2.18.\nThe attack vector is network-based (AV:N), allowing remote threat actors to interact directly with the HTTP services exposed by the vulnerable Helidon instance without requiring authentication (PR:N) or user interaction (UI:N).\nThe exploitation mechanism requires high attack complexity (AC:H), indicating that successful exploitation relies on specific environmental conditions, precise timing, or nuanced payload crafting to bypass existing security controls within the web server architecture.\nThe attack flow begins with an unauthenticated adversary transmitting specially crafted HTTP requests over the network to the vulnerable Imperative Web Server component.\nDue to improper handling of these requests or insufficient input validation and boundary enforcement within the server logic, the application fails to adequately protect sensitive internal data structures or resources.\nUpon successful processing of the malicious payload, the security scope changes (S:C), expanding the impact beyond the immediate Helidon boundary and potentially exposing interconnected products or shared enterprise resources.\nThe post-exploitation impact is strictly concentrated on confidentiality (C:H), resulting in unauthorized retrieval of critical data or complete compromise of all data accessible to the Helidon runtime environment, while integrity (I:N) and availability (A:N) remain unimpacted."
}