CVE-2026-73930

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 3.0.0-3.2.19 and 4.0.0-4.5.2. 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 creation, deletion or modification access to critical data or all Helidon accessible data as well as unauthorized read access to a subset of Helidon accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 9.9 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L).

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

2026-09-06

NVD

CVE-2026-73930

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	helidon	4.5.3

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 4.5.3 and allows unauthenticated attackers to exploit it via HTTP network access. The flaw enables unauthorized data manipulation, data theft, and partial denial of service attacks on Helidon.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable versions of Oracle Helidon 4.5.3. Inspect installed Helidon packages using commands like 'java -jar helidon.jar --version' or checking package managers (e.g., 'dpkg -l | grep helidon' on Debian). Monitor network traffic for HTTP requests targeting Helidon services. Ensure firewalls restrict unauthorized access to Helidon ports (default 8080/8443).

Impact Analysis

An attacker could create, delete, or modify critical data in Helidon, read some data without authorization, or cause a partial system outage. This could disrupt services relying on Helidon and compromise sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection requirements and HIPAA's security rules for protected health information. Non-compliance risks include legal penalties and reputational damage.

Mitigation Strategies

Immediately upgrade Helidon to a version unaffected by this vulnerability. If upgrading is not possible, restrict network access to the Imperative Web Server component via firewall rules or disable the service if not in use.

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