Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.19. 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. CVSS 3.1 Base Score 5.9 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.9",
  "pubDate": "2026-08-18T21:18:23.683Z",
  "pubdate": "2026-08-18T21:18:23.683Z",
  "executiveSummary": "A vulnerability exists in the Helidon product of Oracle Fusion Middleware, specifically within the Imperative Web Server component, affecting version 3.2.19. This security flaw enables an unauthenticated remote attacker with network access via the HTTP protocol to compromise the affected Helidon instance. Successful exploitation of this vulnerability can result in unauthorized access to critical data or complete access to all data accessible by Helidon, strictly impacting confidentiality without affecting integrity or availability.\nThe vulnerability is characterized by a CVSS 3.1 Base Score of 5.9, carrying the vector (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N). The attack vector is network-based (AV:N), meaning no local access is required, and the attack complexity is rated as high (AC:H), indicating that specific conditions or a race condition may be necessary for successful exploitation. Crucially, the vulnerability requires no privileges (PR:N) and no user interaction (UI:N), lowering the barrier for external threat actors. The scope remains unchanged (S:U), but the confidentiality impact is high (C:H), posing significant risk to sensitive corporate or application data exposed through the web server.",
  "technicalDetails": "The vulnerability resides within the Imperative Web Server component of Oracle Helidon version 3.2.19. The root cause stems from improper access controls or flawed request handling logic that fails to properly enforce authorization boundaries over sensitive endpoints or resources exposed via HTTP.\nExploitation of this vulnerability is executed over the network using standard HTTP protocol interactions. Because the attack vector is network-based (AV:N) and requires no authentication or privileges (PR:N), an unauthenticated remote attacker can directly target the listening HTTP endpoints of the vulnerable Helidon instance. Although the attack complexity is classified as high (AC:H), an attacker can leverage crafted HTTP requests designed to bypass existing security checks, exploit improper routing, or manipulate request headers to force the Imperative Web Server into returning sensitive data payloads that should otherwise be restricted.\nThe attack flow proceeds as follows: First, the attacker performs reconnaissance to identify a target running Oracle Helidon version 3.2.19 with network exposure to the Imperative Web Server. Second, the attacker crafts specialized HTTP requests aimed at bypassing the intended authorization controls of the component. Third, due to the high attack complexity (AC:H), the attacker may need to repeatedly send precise sequences of HTTP payloads or exploit specific environmental timing conditions inherent to the Imperative Web Server request processing pipeline. Fourth, upon successful processing of the malicious or crafted request, the Imperative Web Server improperly discloses restricted internal resources or critical data structures.\nThe post-exploitation impact is strictly confined to a high impact on confidentiality (C:H). Once unauthorized access is achieved, the attacker can exfiltrate critical application data, configuration secrets, or complete access to all data accessible by the Helidon instance, leading to severe data exposure risks while leaving system integrity and availability unaffected."
}