CVE-2026-73865 in Helidon
Summary
by MITRE • 08/19/2026
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 3.2.18. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. 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 access to critical data or complete access to all Helidon accessible data. CVSS 3.1 Base Score 9.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
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Analysis
by VulDB Data Team • 08/19/2026
The identified vulnerability resides within the Imperative Web Server component of Oracle Fusion Middleware Helidon, specifically affecting version 3.2.18. This security flaw represents a critical failure in access control mechanisms that governs how unauthenticated users interact with the web server interface. The core technical issue stems from an insufficient validation or authorization check during HTTP request processing, which allows external actors to bypass standard authentication protocols. Because the vulnerability is easily exploitable and requires no user interaction or complex preconditions, it presents a severe risk to any deployment of this specific version that exposes its endpoints over a network.
From a technical perspective, the flaw enables an unauthenticated attacker with network access via HTTP to execute arbitrary actions on the server. The absence of proper authentication checks means that sensitive administrative functions or data manipulation APIs are accessible without valid credentials. This aligns closely with CWE-287, which describes Improper Authentication, and CWE-306, Missing Authentication for Critical Function. The attacker can leverage this weakness to perform unauthorized operations such as creating new user accounts, deleting existing records, or modifying critical system configurations and data stores that are typically protected by higher-level security controls.
The operational impact of exploiting this vulnerability is substantial, characterized by high impacts on both confidentiality and integrity while availability remains largely unaffected according to the provided CVSS vector. An attacker who successfully exploits this flaw can gain complete access to all Helidon accessible data, leading to a total compromise of information confidentiality. Furthermore, the ability to create, delete, or modify critical data results in significant integrity violations, potentially allowing for data corruption, persistence mechanisms establishment, or lateral movement within the broader infrastructure. This scenario is consistent with ATT&CK techniques related to Initial Access and Credential Access, where attackers establish footholds by exploiting misconfigured services to extract sensitive information or alter system state without detection.
The CVSS 3.1 base score of 9.1 reflects the severity of this issue due to its network exploitability vector, low complexity, lack of required privileges for the attacker, and unchanged scope with high confidentiality and integrity impacts. Organizations running Helidon version 3.2.18 must treat this as a critical priority for remediation. Immediate mitigation strategies include upgrading to a patched version of Oracle Fusion Middleware where these access control checks have been reinforced. In cases where immediate patching is not feasible, network-level controls such as firewall rules restricting HTTP access to the Helidon endpoints should be implemented to limit exposure to trusted networks only. Additionally, implementing Web Application Firewall (WAF) policies can help detect and block exploit attempts targeting this specific vulnerability by monitoring for anomalous request patterns associated with unauthorized data manipulation or authentication bypasses.