CVE-2026-73933 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 4.5.3. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. 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 and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 7.3 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).
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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 4.5.3. This security flaw represents a critical weakness in how the web server processes incoming HTTP requests from unauthenticated actors. The core technical issue stems from insufficient validation or sanitization mechanisms applied to data received over network connections, allowing an attacker with remote access via standard HTTP protocols to manipulate internal application logic. Because the vulnerability is easily exploitable and requires no authentication, it presents a significant risk surface for any deployment of this specific version that exposes its web server endpoints to external networks without additional protective layers such as Web Application Firewalls or strict network segmentation.
From an operational perspective, the successful exploitation of this flaw leads to severe compromises across multiple security domains defined by the CIA triad. The attacker gains unauthorized read access to a subset of data accessible by Helidon, which constitutes a breach of confidentiality and may expose sensitive business information, user credentials, or proprietary logic depending on the application's implementation. Furthermore, the vulnerability allows for unauthorized updates, inserts, or deletes against accessible data stores, representing a critical failure in integrity controls that can lead to data corruption, defacement, or persistent backdoors within the application database. Additionally, the ability to cause a partial denial of service impacts availability by consuming system resources through maliciously crafted requests, potentially degrading performance for legitimate users or causing temporary unavailability of services hosted on the affected instance.
In terms of industry standard classification, this vulnerability aligns with CWE-94 Improper Control of Generation of Code (Code Injection) or CWE-20 Poor Input Validation depending on the specific mechanism exploited within the web server framework. The attack vector is categorized under ATT&CK technique T1190 Exploit Public-Facing Application, as it leverages a publicly accessible service to gain initial access and execute malicious actions without prior authentication. The CVSS 3.1 base score of 7.3 reflects High severity due to the combination of network accessibility, low complexity, lack of required privileges for the attacker, and significant impacts on confidentiality, integrity, and availability.
To mitigate this risk, immediate action is required to patch or upgrade Helidon to a version where this vulnerability has been resolved by Oracle Fusion Middleware engineering teams. Organizations should also implement defense-in-depth strategies including network-level access controls that restrict HTTP traffic from untrusted sources to the web server components only when necessary. Deploying Web Application Firewalls with updated rule sets can help detect and block exploit attempts targeting input validation flaws. Regular security assessments, including penetration testing focused on injection and authorization bypasses, are recommended to identify similar weaknesses in custom implementations built upon Helidon before they can be exploited by malicious actors.