CVE-2026-70716 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. Difficult to exploit 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. CVSS 3.1 Base Score 5.9 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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 is characterized by a difficulty in exploitation that requires an unauthenticated attacker to have network access via HTTP to successfully compromise the system. The core technical issue involves a failure in proper input validation or state management within the web server's request handling logic, which allows malicious actors to manipulate critical data operations without prior authentication. Because the vulnerability permits unauthorized creation, deletion, or modification of both critical application data and all Helidon accessible data, it represents a significant threat to the integrity of the hosted applications and their underlying information assets.
From an architectural perspective, this flaw aligns with CWE-94 Improper Control of Generation of Code (Code Injection) or potentially CWE-200 Exposure of Sensitive Information depending on the specific vector used for data modification, though the primary impact is classified under integrity violations. The vulnerability enables a remote attacker to alter the state of the application server by exploiting weaknesses in how HTTP requests are processed and validated before execution. This lack of robust validation allows an adversary to inject malicious commands or manipulate internal variables that control access permissions and data persistence mechanisms. Consequently, even though the attack complexity is rated as high due to specific conditions required for successful exploitation, the absence of authentication requirements significantly lowers the barrier for entry compared to authenticated vulnerabilities.
The operational impact of this vulnerability is severe regarding data integrity but limited in scope concerning confidentiality and availability based on the provided CVSS vector. The CVSS 3.1 Base Score of 5.9 reflects a medium severity level driven primarily by high integrity impacts while maintaining no effect on confidentiality or availability. This means that an attacker who successfully exploits this flaw can corrupt, delete, or fabricate data within the Helidon environment but cannot necessarily exfiltrate sensitive information directly through this specific vector nor cause a denial of service. The ability to modify critical data undermines trust in the application's outputs and may lead to cascading failures if downstream systems rely on the integrity of the modified data for decision-making processes.
In terms of threat modeling, this vulnerability maps to MITRE ATT&CK techniques related to Data Manipulation or potentially Initial Access via Web Application Attacks such as HTTP Request Smuggling if applicable to the specific implementation details not fully disclosed in the summary. The attack vector is classified as Network with High Attack Complexity and No Privileges Required, indicating that while remote exploitation is possible, it likely requires precise timing or specific payload structures that are non-trivial to construct without detailed knowledge of the internal state machine of the Helidon server. This complexity serves as a natural deterrent against opportunistic attacks but remains a serious concern for targeted adversaries with sufficient resources and technical expertise.
Mitigation strategies should focus on immediate patching to the latest supported version of Oracle Fusion Middleware Helidon where this flaw has been addressed by engineering teams through enhanced input sanitization and stricter access control checks within the Imperative Web Server module. In environments where upgrading is not immediately feasible, network-level controls such as Web Application Firewalls can be configured to inspect HTTP traffic for patterns indicative of exploitation attempts targeting known vulnerability signatures associated with Helidon 4.5.0. Additionally, implementing strict authentication requirements at the reverse proxy or load balancer layer before requests reach the Helidon instance can effectively neutralize this threat by ensuring that only authenticated users interact with the vulnerable component, thereby mitigating the risk posed by unauthenticated access vectors.