CVE-2026-73898

Modified Modified - Updated After Analysis

Unauthenticated Data Access in Oracle 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 4.0.0-4.4.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks require human interaction from a person other than the attacker and 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 6.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

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-2026-73898

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	helidon	4.5.0

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 vulnerability affects Oracle Fusion Middleware's Helidon product, specifically version 4.5.0. It allows an unauthenticated attacker to remotely access and compromise the Imperative Web Server component via HTTP. Exploitation requires the victim to interact with a malicious request, and successful attacks can lead to unauthorized data access or modification.

Detection Guidance

Detection of CVE-2026-73898 requires checking for vulnerable versions of Oracle Helidon 4.5.0. Inspect installed Helidon packages using commands like 'java -jar helidon.jar --version' or package managers such as 'dpkg -l | grep helidon' or 'rpm -qa | grep helidon' on Linux systems. Monitor network traffic for HTTP requests targeting Helidon services.

Impact Analysis

An attacker could read or alter some data accessible through Helidon without authentication. This could lead to data breaches, unauthorized changes, or further attacks on connected systems. The impact depends on the data processed by Helidon in your environment.

Compliance Impact

This vulnerability allows unauthorized read and limited write access to data in Helidon, which could lead to exposure of sensitive information. This may impact compliance with GDPR (data confidentiality requirements) and HIPAA (protected health information safeguards) if exploited.

Mitigation Strategies

Upgrade Helidon to a version unaffected by this vulnerability. If upgrading is not immediately possible, restrict network access to the Imperative Web Server component via firewalls or network segmentation. Monitor Oracle's security advisories for patches or workarounds.

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