CVE-2026-73917 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 4.5.0. 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 4.5.0. This security flaw represents a critical weakness in the application layer that permits unauthenticated attackers to exploit the system over standard HTTP network connections. The absence of required authentication for this specific attack vector significantly lowers the barrier for entry, allowing any remote actor with basic network connectivity to initiate an exploitation attempt without needing valid credentials or user interaction.
From a technical perspective, the flaw likely stems from improper validation or handling of input data within the imperative web server logic. Such defects typically involve insufficient sanitization of HTTP requests, leading to scenarios where malicious payloads can bypass intended security controls. The high severity score indicates that the vulnerability allows for direct manipulation of system resources and data integrity mechanisms. Attackers can leverage this weakness to execute arbitrary operations on the backend systems managed by Helidon, effectively gaining a foothold within the middleware environment without detection or prior authorization.
The operational impact of successfully exploiting this vulnerability is severe, characterized by comprehensive compromises in both confidentiality and integrity. An attacker with successful access can create, delete, or modify critical data stored within the Helidon ecosystem. This capability extends to all accessible data, meaning that sensitive information such as user credentials, business logic configurations, or proprietary datasets could be exfiltrated or altered. The ability to perform unauthorized modifications poses a direct threat to the reliability and trustworthiness of the applications relying on this middleware, potentially leading to service disruption, data corruption, or further lateral movement within the network infrastructure.
In terms of industry standard classifications, this vulnerability aligns with CWE-20 Improper Input Validation and CWE-79 Cross-site Scripting if web-based injection is involved, though given the broad impact described, it may also relate to CWE-564 SQL Injection or other code execution flaws depending on the specific implementation details. The attack vector corresponds to MITRE ATT&CK techniques involving Initial Access via Network Service Exploitation and potentially Persistence or Impact through Data Manipulation. The CVSS 3.1 base score of 9.1 reflects these high impacts, with vectors indicating network accessibility, low complexity, no privileges required, and no user interaction needed.
Mitigation strategies must prioritize immediate patching to the latest secure version of Oracle Fusion Middleware Helidon where this flaw has been addressed by the vendor. In environments where upgrading is not immediately feasible, organizations should implement strict access control lists at the network perimeter to restrict HTTP traffic destined for the vulnerable component only from trusted sources. Additionally, deploying a Web Application Firewall with rulesets designed to detect and block anomalous input patterns can provide an additional layer of defense against exploitation attempts. Continuous monitoring of system logs for unusual data modification events or unauthorized access attempts is also recommended to identify potential breaches early.