CVE-2026-73887

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/2 to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Helidon accessible data. CVSS 3.1 Base Score 7.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

CVSS 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-2026-73887

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 is a vulnerability in Oracle Fusion Middleware's Helidon product, specifically in the Imperative Web Server component. It affects version 4.5.0 and allows an unauthenticated attacker to exploit it via HTTP/2 without needing access to the system or user interaction. The flaw enables unauthorized access to sensitive data or complete access to all data accessible by Helidon.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable versions of Oracle Helidon 4.5.0. Use commands like 'curl -I http://<target>:<port>' to inspect server headers for Helidon version details. Network scans with tools like Nmap may identify services running Helidon. Ensure your Helidon instances are updated beyond 4.5.0 to mitigate risks.

Impact Analysis

If you use the affected Helidon version, an attacker could gain unauthorized access to critical or all accessible data in your system. This could lead to data breaches, loss of sensitive information, or further exploitation of connected systems.

Compliance Impact

This vulnerability could lead to unauthorized data access, which may violate GDPR (data protection) and HIPAA (health information privacy) requirements. Non-compliance risks include legal penalties, fines, and reputational damage due to potential data breaches.

Mitigation Strategies

Update Helidon to a version that is not affected by this vulnerability. If updating is not immediately possible, restrict network access to the Imperative Web Server component via HTTP/2 and apply network-level protections to block unauthorized access.

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