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. While the vulnerability is in Helidon, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Helidon accessible data as well as unauthorized read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 7.2 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.2",
  "pubDate": "2026-08-18T21:18:20.957Z",
  "pubdate": "2026-08-18T21:18:20.957Z",
  "executiveSummary": "An easily exploitable vulnerability exists within the Imperative Web Server component of the Oracle Fusion Middleware product Helidon, specifically affecting supported version 3.2.18. This security flaw allows unauthenticated threat actors with network access via the HTTP protocol to successfully compromise the targeted Helidon instance. The architectural nature of this vulnerability introduces a scope change, meaning that successful exploitation is not strictly contained within the Helidon runtime environment but may also significantly impact additional integrated or associated products. From a security impact perspective, successful attacks can result in unauthorized read access to a subset of Helidon-accessible data, alongside unauthorized update, insert, or delete access to other portions of accessible data. The CVSS 3.1 Base Score is calculated at 7.2, reflecting high severity due to the lack of required authentication, privileges, or user interaction, combined with network-based vector accessibility and impacts spanning confidentiality and integrity.\nThe risk implications are substantial for organizations deploying the affected Helidon version, as remote unauthenticated entities can manipulate and exfiltrate sensitive data across system boundaries due to the scope-altering nature of the flaw. Remediation requires strict adherence to vendor-supplied patches and updates for the Helidon ecosystem.",
  "technicalDetails": "The vulnerability resides within the Imperative Web Server component of Oracle Helidon version 3.2.18. The root cause stems from insufficient access controls, input validation, or boundary enforcement within the HTTP request processing pipeline of the web server component, which fails to adequately restrict unauthorized operations performed by remote clients.\nExploitation of this vulnerability requires no prior authentication, low attack complexity, and zero user interaction. An unauthenticated attacker leverages network access via the HTTP protocol to interact directly with the vulnerable Imperative Web Server. By crafting malicious HTTP requests directed at unprotected or improperly secured endpoints within the Helidon application, the attacker bypasses intended security boundaries.\nThe attack flow proceeds as follows: First, the remote attacker establishes a standard network connection over HTTP to the target Helidon instance running version 3.2.18. Second, the attacker transmits a maliciously crafted HTTP payload designed to exploit the logic flaw within the Imperative Web Server component. Third, because the vulnerability introduces a scope change (S:C), the processing of this payload transcends the immediate Helidon security context, potentially affecting secondary downstream or upstream products interacting within the same architectural ecosystem. Finally, the server processes the request without enforcing proper authorization checks, granting the attacker unauthorized read access to a subset of Helidon-accessible data and unauthorized update, insert, or delete capabilities against other accessible data stores.\nThe network exposure is direct and exterior-facing wherever the vulnerable Helidon HTTP server is exposed to untrusted networks. Payload behavior involves unauthorized data manipulation and retrieval without triggering local authentication mechanisms. Post-exploitation impact encompasses data integrity degradation via unauthorized insertion, modification, or deletion of records, alongside confidentiality breaches through the unauthorized extraction of sensitive data subsets."
}