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 low privileged attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in takeover of Helidon. CVSS 3.1 Base Score 7.5 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-18T21:18:17.330Z",
  "pubdate": "2026-08-18T21:18:17.330Z",
  "executiveSummary": "A vulnerability has been identified within the Oracle Fusion Middleware product Helidon, specifically residing in the Imperative Web Server component. The supported software version affected by this security issue is 3.2.18.\nThis vulnerability is classified as a difficult to exploit flaw that can be leveraged by a low-privileged attacker with network access via the HTTP protocol to fully compromise the target Helidon instance.\nSuccessful exploitation of this security issue carries severe risk implications, yielding high impacts across all three pillars of the CIA triad: Confidentiality, Integrity, and Availability. These impacts culminate in the complete takeover of the affected Helidon application.\nThe assigned Common Vulnerability Scoring System (CVSS) 3.1 Base Score is 7.5, with the corresponding vector string designated as CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.\nThe exploitation requirements dictate network accessibility, a high attack complexity constraint, and authenticated low-privileged access, though no user interaction is necessitated to achieve successful exploitation.",
  "technicalDetails": "The vulnerability manifests within the Imperative Web Server component of Oracle Helidon version 3.2.18. Due to implementation flaws within request handling or processing logic, the system fails to adequately validate or restrict inputs and operations exposed over the network via HTTP.\nAttack execution requires the threat actor to possess low-privileged credentials or access within the network boundary exposed by the Imperative Web Server. Because the attack vector is network-based (AV:N), the adversary interacts directly with the HTTP service endpoints.\nThe attack complexity is rated as high (AC:H), implying that successful exploitation likely demands specific race conditions, precise timing, complex payload structuring, or specific environmental preconditions to successfully bypass existing defensive controls within the web server architecture.\nThe step-by-step attack flow begins with the low-privileged attacker establishing an HTTP connection to the vulnerable Imperative Web Server. The attacker crafts and transmits a specialized, malicious HTTP request designed to exploit the underlying logic flaw in the component.\nUpon receiving the payload, the Imperative Web Server improperly processes the input due to internal validation failures. This flaw allows the attacker to execute unauthorized actions, escalate privileges, or corrupt memory and application state structures.\nFollowing post-exploitation, the compromise escalates to a full takeover of the Helidon instance. The attacker achieves arbitrary control over the application runtime, enabling the reading, modification, or destruction of confidential data, alongside complete disruption of system availability."
}