CVE-2026-73868 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 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 6.5 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 4.5.0. This security flaw represents a critical weakness in how the web server handles incoming HTTP requests without adequate validation or authentication mechanisms. The core technical issue stems from insufficient access control checks during request processing, allowing unauthenticated actors to interact with internal data structures and endpoints that should be restricted. Because the vulnerability is easily exploitable via network-accessible HTTP protocols, it presents a significant risk to any deployment of this specific version where external connectivity exists without additional perimeter security controls such as reverse proxies or API gateways enforcing strict authentication policies prior to reaching Helidon.
From an operational perspective, the impact of this vulnerability extends beyond simple data exposure. The attacker gains the ability to perform unauthorized updates, inserts, and deletes against accessible data within the Helidon environment. This capability directly compromises the integrity of the application state, potentially leading to data corruption, service disruption, or manipulation of business logic outcomes. Furthermore, the vulnerability permits unauthorized read access to a subset of accessible data, which constitutes a breach of confidentiality. An attacker could extract sensitive information stored in memory or backed by persistent storage managed by Helidon, depending on how the framework is configured and what data it exposes through its imperative web server interface. The combination of these impacts means that an adversary can not only steal data but also alter system behavior and content, undermining trust in the application's reliability and security posture.
In terms of industry-standard classification, this vulnerability aligns with CWE-287, which describes Improper Authentication, as well as CWE-918, Server-Side Request Forgery (SSRF) if the flaw involves manipulating internal requests, though the primary descriptor here is unauthorized access leading to data manipulation. The attack vector corresponds to MITRE ATT&CK technique T1059, Command and Scripting Interpreter, or more broadly T1190, Exploit Public-Facing Application, as it leverages a network-accessible service to execute malicious actions without prior authentication. The CVSS 3.1 base score of 6.5 reflects the medium severity driven by high availability (network access), low complexity, and no required user interaction or privileges for exploitation. However, the specific impacts on confidentiality and integrity elevate the risk profile significantly in environments where data sensitivity is paramount.
Mitigation strategies must focus on immediate remediation through patching as well as architectural hardening. The primary recommendation is to upgrade Helidon to a version that includes patches addressing this access control flaw, ensuring that Oracle's latest security updates are applied promptly. In scenarios where upgrading is not immediately feasible, organizations should implement network-level controls such as Web Application Firewalls (WAFs) or API gateways in front of the Helidon instance to enforce authentication and authorization checks before requests reach the vulnerable component. Additionally, reviewing application code for proper use of security annotations and ensuring that sensitive endpoints are explicitly secured with authentication filters can reduce the attack surface. Regular vulnerability scanning and penetration testing should be conducted to identify similar misconfigurations or unpatched components within the broader Oracle Fusion Middleware ecosystem.