Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Helidon accessible data. CVSS 3.1 Base Score 7.5 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-18T21:18:20.277Z",
  "pubdate": "2026-08-18T21:18:20.277Z",
  "executiveSummary": "An easily exploitable vulnerability exists within the Helidon product of Oracle Fusion Middleware, specifically localized to the Imperative Web Server component. This security flaw enables unauthenticated threat actors leveraging network access via the HTTP protocol to compromise the affected Helidon instance. Successful exploitation of this vulnerability directly impacts data integrity, granting unauthorized actors the capability to execute critical data creation, modification, or deletion operations against accessible Helidon data stores or application states. The vulnerability carries a CVSS 3.1 Base Score of 7.5, reflecting its severe integrity impact despite confidentiality and availability remaining uncompromised. The attack vector is fully network-accessible (AV:N), featuring low attack complexity (AC:L) and requiring zero privileges (PR:N) or user interaction (UI:N) within an unchanged security scope (S:U). Organizations running the affected version face significant operational risks regarding unauthorized state manipulation, necessitating immediate defensive evaluation and remediation alignment based on official vendor advisories and security updates.",
  "technicalDetails": "The vulnerability resides within the Imperative Web Server component of the Oracle Helidon product, specifically affecting version 4.5.1. The underlying root cause involves inadequate validation, sanitization, or access control enforcement within request handling routines exposed over the HTTP protocol. Because the architecture of the Imperative Web Server processes incoming network traffic directly, improper handling of specific request structures or payloads allows unauthenticated clients to bypass intended security boundaries and invoke unauthorized data manipulation routines.\nExploitation of this vulnerability requires no prior authentication or user interaction, lowering the barrier to entry for external adversaries. An attacker positioned with standard network access to the target Helidon instance can craft malicious HTTP requests designed to target the vulnerable Imperative Web Server component. Upon receipt, the server fails to properly restrict or verify the authorization context of the incoming command or transaction, treating the unauthorized request as legitimate.\nThe attack flow proceeds as follows: First, the adversary establishes an HTTP connection to the vulnerable network port hosting the Helidon Imperative Web Server. Second, the attacker transmits a maliciously crafted HTTP payload tailored to exploit the validation or authorization flaw within the component. Third, the Imperative Web Server processes the request without enforcing necessary privilege checks or input integrity constraints. Finally, the payload executes backend logic that permits unauthorized data operations.\nThe post-exploitation impact is characterized by severe integrity violations. Successful attacks allow unauthorized modification, deletion, or creation of critical data managed or accessible by the Helidon application. The CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) confirms that while confidentiality (C:N) and availability (A:N) are not impacted, the integrity (I:H) vector is severely degraded, posing a critical risk to application state consistency and business logic reliability."
}