Oracle Helidon 4.5.3 Imperative Web Server improper authorization

Summaryinfo

A vulnerability was found in Oracle Helidon 4.5.3. It has been classified as critical. This impacts an unknown function of the component Imperative Web Server. This manipulation causes improper authorization. This vulnerability is tracked as CVE-2026-73928. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Oracle Helidon 4.5.3 and classified as critical. Affected by this vulnerability is an unknown code block of the component Imperative Web Server. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.3. 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 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 7.2 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N).

It is possible to read the advisory at oracle.com. This vulnerability is known as CVE-2026-73928 since 08/13/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/19/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Oracle

Name

• Helidon

Version

• 4.5.3

License

• commercial

Website

• Vendor: https://www.oracle.com

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