CVE-2026-71166

Modified Modified - Updated After Analysis

Unauthenticated Data Manipulation in Helidon

Publication date: 2026-08-18

Last updated on: 2026-08-28

Assigner: Oracle

Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 3.0.0-3.2.17. 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 as well as unauthorized access to critical data or complete access to all Helidon accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 9.4 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L).

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-18

Last Modified

2026-08-28

Generated

2026-09-08

AI Q&A

2026-08-19

EPSS Evaluated

2026-09-07

NVD

CVE-2026-71166

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	helidon	3.2.18

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Fusion Middleware's Helidon product, specifically in the Imperative Web Server component. It affects version 3.2.18 and allows unauthenticated attackers to remotely exploit it via HTTP. Successful exploitation can lead to unauthorized data access, modification, or deletion, as well as partial denial of service.

Detection Guidance

Detecting this vulnerability requires checking if your system is running Oracle Helidon version 3.2.18. Use commands like 'java -jar helidon.jar --version' or check application logs for Helidon framework references. Network scanning tools like Nmap can identify exposed Helidon services on HTTP ports.

Impact Analysis

If you use Helidon 3.2.18, an attacker could gain full access to your system's data, modify or delete critical files, or disrupt services. This could lead to data breaches, loss of sensitive information, or operational downtime.

Compliance Impact

This vulnerability could lead to unauthorized access or modification of sensitive data, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Non-compliance may result in legal penalties, fines, or reputational damage.

Mitigation Strategies

Immediately upgrade Oracle Helidon to a version later than 3.2.18. If upgrading is not possible, restrict network access to Helidon services via firewalls or disable HTTP interfaces. Apply Oracle's official patches as soon as they are released.

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