CVE-2026-73879 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 4.5.1. 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. CVSS 3.1 Base Score 7.5 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/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 4.5.1. This security flaw represents a critical weakness in the application layer's handling of incoming HTTP requests, allowing for unauthorized manipulation of server-side resources without requiring any form of authentication or user interaction. The nature of this vulnerability aligns with CWE-922, which describes Improper Access Control, as the system fails to enforce appropriate restrictions on who can perform actions such as creating, deleting, or modifying data within the Helidon environment. This lack of proper access verification enables an attacker to bypass security boundaries that should logically restrict write operations to authenticated and authorized users only.
From a technical perspective, the flaw permits unauthenticated attackers with network access via HTTP to exploit the vulnerability remotely. The attack vector is classified as Network (AV:N) with Low Complexity (AC:L), indicating that no specialized conditions or user interaction are required to trigger the exploitation. Once an attacker identifies the vulnerable endpoint or mechanism within the Helidon web server, they can send crafted requests that manipulate internal state variables or database interactions directly. Because the vulnerability allows for unauthorized creation, deletion, and modification of critical data, it fundamentally breaks the integrity guarantees expected from a secure enterprise middleware platform. The absence of authentication requirements (PR:N) significantly lowers the barrier to entry for malicious actors, making this a high-risk issue that can be exploited by any entity capable of reaching the server over the network.
The operational impact of successfully exploiting this vulnerability is severe, primarily centered on data integrity rather than confidentiality or availability in its immediate manifestation. An attacker who gains control through this flaw can alter critical business logic, corrupt databases, inject malicious content into stored records, or delete essential configuration files and user data. This level of access effectively grants the attacker administrative-like capabilities over the application's data layer, potentially leading to significant financial loss, reputational damage, and regulatory non-compliance depending on the sensitivity of the affected information. The CVSS 3.1 Base Score of 7.5 reflects this high severity due to the substantial integrity impact (I:H) while noting that confidentiality and availability are not directly impacted by this specific vector, although secondary effects such as denial-of-service through data deletion could occur.
In terms of threat modeling and industry standards, this vulnerability maps closely to MITRE ATT&CK techniques involving unauthorized access and modification of system or user files. It exemplifies a scenario where an attacker leverages improper input validation or authorization checks to achieve persistence or impact on business operations. The lack of authentication requirement places it in the initial access phase of the kill chain, allowing for rapid exploitation before security teams can detect anomalous behavior. Organizations relying on Helidon 4.5.1 are at significant risk if this component is exposed to untrusted networks without additional compensating controls such as Web Application Firewalls that strictly filter HTTP methods and parameters associated with write operations.
To mitigate the risks associated with this vulnerability, immediate action is required to update the Oracle Fusion Middleware Helidon installation to a patched version where these access control flaws have been resolved by Oracle engineering teams. Until an upgrade can be performed, organizations should implement network-level restrictions to limit exposure of the vulnerable component to trusted IP addresses only. Additionally, deploying a Web Application Firewall with rulesets designed to detect and block unauthorized write requests or anomalous HTTP patterns can provide a layer of defense against exploitation attempts. Security monitoring should also be enhanced to alert on unusual data modification events originating from unauthenticated sources, ensuring that any successful exploitation is detected quickly for incident response purposes. Regular vulnerability scanning and penetration testing focused on authentication bypasses are recommended to identify similar weaknesses in other components of the middleware stack before they can be leveraged by adversaries.