Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.18. Easily exploitable 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 7.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-18T21:18:20.733Z",
  "pubdate": "2026-08-18T21:18:20.733Z",
  "executiveSummary": "An unauthorized information disclosure vulnerability affects the Oracle Fusion Middleware Helidon product, specifically within the Imperative Web Server component in version 3.2.18. This flaw allows unauthenticated remote attackers with network access via the HTTP protocol to compromise the system and achieve unauthorized access to critical data, or potentially obtain complete access to all data accessible by Helidon.\nThe vulnerability carries a CVSS 3.1 Base Score of 7.5, with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. The attack vector is network-based, featuring low attack complexity, requiring no privileges, and needing no user interaction. The security scope remains unchanged, with impact strictly isolated to high confidentiality degradation, while integrity and availability remain unaffected.\nThe primary risk implication is the exposure of sensitive application data to external adversaries without requiring prior authentication or specialized access credentials. Exploitation requires standard network connectivity to the vulnerable Imperative Web Server endpoint exposed by the Helidon runtime.",
  "technicalDetails": "The vulnerability resides within the Imperative Web Server component of Oracle Helidon version 3.2.18. The underlying root cause stems from improper input validation, weak access control enforcement, or flawed request parsing mechanisms within the web server implementation, which improperly exposes internal resources or sensitive data streams over standard HTTP channels.\nExploitation is initiated over the network layer via the HTTP protocol. Because the vulnerability requires no authentication and zero privileges, an unauthenticated remote attacker can directly craft and transmit malicious HTTP requests targeting the vulnerable endpoints exposed by the Helidon Imperative Web Server.\nThe attack flow proceeds as follows: First, the adversary establishes a standard TCP/HTTP connection to the target port hosting the Helidon application. Second, the attacker sends a specially crafted HTTP request designed to bypass authorization checks or exploit routing and handler logic flaws within the Imperative Web Server component. Third, the vulnerable component processes the request without validating whether the requester possesses the appropriate context or authorization tokens. Finally, the application responds by returning sensitive internal data or critical application payloads back to the unauthorized client.\nPost-successful exploitation, the attacker achieves severe confidentiality compromise. Depending on the exact nature of the exposed data, this may include application configuration secrets, internal database records, session tokens, or other sensitive business logic data accessible within the operational scope of the Helidon runtime environment. The attack does not impact system integrity or system availability, as the CVSS vector strictly bounds the impact to high confidentiality degradation."
}