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 read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.3",
  "pubDate": "2026-08-18T21:18:22.100Z",
  "pubdate": "2026-08-18T21:18:22.100Z",
  "executiveSummary": "An unauthenticated information disclosure vulnerability has been identified within the Imperative Web Server component of Oracle Fusion Middleware Helidon version 3.2.18. This security flaw allows remote attackers with network access via the HTTP protocol to compromise the confidentiality of the system by successfully executing unauthorized read operations against a specific subset of accessible data managed by the application. The vulnerability is classified as easily exploitable, requiring no user interaction, low attack complexity, and zero prior authentication or elevated privileges from the threat actor. The primary impact is strictly confined to confidentiality degradation, yielding a CVSS 3.1 Base Score of 5.3 with a vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. The risk implications include the potential exposure of sensitive internal data structures or application-specific information exposed via the vulnerable web server interface. Organizations utilizing the affected software must review their exposure profile and implement necessary defensive postures to prevent unauthorized data retrieval over the network.",
  "technicalDetails": "The vulnerability resides within the Imperative Web Server component of the Helidon product within Oracle Fusion Middleware, specifically affecting version 3.2.18. The architectural root cause involves improper handling or validation of incoming HTTP requests processed by the web server layer, which inadvertently permits unauthorized access to resources or data subsets that should otherwise be restricted or protected from external viewing. Exploitation of this flaw is executed remotely over the network via standard HTTP protocol communications. Because the vulnerability requires no authentication and no privileges, an unauthenticated attacker can directly target the exposed HTTP endpoints of the Helidon instance without needing valid user credentials or session tokens. The attack flow begins when the adversary crafts a malicious or specially formatted HTTP request designed to interact with the vulnerable Imperative Web Server component. Upon receipt, the affected component fails to adequately enforce access controls or data boundary checks, processing the request and returning the requested data to the client in the HTTP response body. The payload behavior centers on unauthorized data retrieval rather than code execution or denial of service, aligning with the confidentiality-only impact metric. Post-exploitation impact is limited to the unauthorized read access of the specific subset of Helidon accessible data exposed by the flawed component. The attack complexity is low, meaning that the exploitation vector is reliable and does not require advanced evasion techniques or complex race conditions. Network exposure is a prerequisite, necessitating that the Helidon instance is reachable over an IP network by the malicious actor. Remediation requires addressing the underlying access control or request processing logic flaws within the Imperative Web Server component of the affected version."
}