CVE-2026-73928 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. 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).
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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 handles incoming HTTP requests without proper authentication or input validation mechanisms. The core technical issue allows an unauthenticated attacker to exploit this deficiency by sending specially crafted network packets over standard HTTP protocols. Because the vulnerability is located within Helidon, which serves as a foundational framework for many enterprise applications built on Oracle Fusion Middleware, the impact extends beyond the immediate component. This scope change indicates that attacks targeting this specific flaw can cascade into broader system compromises, potentially affecting additional products and services that rely on or integrate with Helidon's web server capabilities.
From an operational perspective, the exploitation of this vulnerability grants attackers significant control over data integrity and confidentiality within the affected environment. Successful exploitation enables unauthorized updates, inserts, or deletions to accessible data stores, which constitutes a severe breach of data integrity. Furthermore, it permits unauthorized read access to a subset of Helidon-accessible data, leading to potential information disclosure. The combination of these impacts means that an attacker can not only steal sensitive information but also alter critical application state or database records without detection by standard authentication controls. This dual impact on confidentiality and integrity aligns with high-severity classifications in vulnerability scoring systems, reflecting the serious nature of the threat posed to enterprise data assets.
The severity of this issue is quantified by a CVSS 3.1 Base Score of 7.2, categorized as High. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N) highlights several key characteristics that contribute to its risk profile. The Attack Vector is Network, indicating remote exploitability without physical access. The Attack Complexity is Low and Privileges Required are None, meaning the vulnerability can be exploited by any network user with minimal effort and no prior credentials. User Interaction is also listed as None, suggesting automated exploitation is feasible. Notably, the Scope changes from C to S:C, confirming that the impact extends beyond the vulnerable component to other security boundaries within the system architecture. While Availability remains unaffected in this specific vector, the compromise of Confidentiality (Low) and Integrity (Low) poses substantial risks depending on the sensitivity of the data involved.
In terms of industry standard classifications, this vulnerability maps closely to CWE-94 Improper Control of Generation of Code or Script, often referred to as injection vulnerabilities, particularly if the flaw involves server-side code execution or dynamic content generation based on unvalidated input. It also aligns with ATT&CK technique T1059 Command and Scripting Interpreter if the exploitation leads to arbitrary command execution, or T1136 Create Account if it allows privilege escalation through data manipulation. The lack of authentication requirements places this firmly within the context of broken access control principles outlined in OWASP Top 10 categories for web application security failures.
Mitigation strategies must prioritize immediate patching and architectural review. Organizations running Helidon version 4.5.3 should apply the latest vendor-provided patches to address the specific flaw in the Imperative Web Server component. Until patches are applied, network-level controls such as Web Application Firewalls (WAFs) can be configured to detect and block malicious HTTP payloads associated with this vulnerability type. Input validation must be rigorously enforced at all entry points where data is processed by Helidon's web server logic. Additionally, implementing strict authentication requirements for administrative interfaces and sensitive endpoints can reduce the attack surface even if the core flaw remains unpatched temporarily. Regular security audits and penetration testing focused on HTTP request handling are recommended to identify similar weaknesses in related components before they can be exploited.