Oracle Helidon 4.5.1 Imperative Web Server improper authorization

Summaryinfo

A vulnerability has been found in Oracle Helidon 4.5.1 and classified as critical. Affected by this vulnerability is an unknown functionality of the component Imperative Web Server. The manipulation leads to improper authorization. This vulnerability is documented as CVE-2026-73876. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Oracle Helidon 4.5.1. It has been rated as critical. This issue affects an unknown part of the component Imperative Web Server. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to 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. Impacted is 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 4.5.1. 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).

The advisory is shared at oracle.com. The identification of this vulnerability is CVE-2026-73876 since 08/13/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/19/2026). MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

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

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-2026-99441131). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Oracle

Name

• Helidon

Version

• 4.5.1

License

• commercial

Website

• Vendor: https://www.oracle.com

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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