CVE-2026-73920 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 creation, deletion or modification access to critical data or all Helidon accessible data as well as unauthorized access to critical data or complete access to all Helidon accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 9.4 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 4.5.0. This security flaw is characterized by its high severity and ease of exploitation, allowing an unauthenticated attacker to compromise the system through standard HTTP network access. The absence of required authentication mechanisms means that any external entity with network connectivity to the affected service can initiate attacks without needing valid credentials or user interaction. This lack of access control represents a fundamental failure in security architecture, where critical endpoints are exposed to public networks without adequate validation gates.
From a technical perspective, this vulnerability enables unauthorized creation, deletion, and modification of critical data as well as all accessible Helidon data. The attacker gains the ability to alter system state arbitrarily, which directly impacts the integrity of the application environment. Furthermore, the flaw permits complete access to sensitive information stored within or managed by Helidon, leading to a total breach of confidentiality. This level of access suggests that internal logic for handling HTTP requests may be flawed in its parsing or execution phases, potentially allowing injection attacks, path traversal, or improper authorization checks that bypass intended security boundaries. The combination of read and write privileges granted to an unauthenticated user indicates a severe misconfiguration or code defect in the web server's request processing pipeline.
The operational impact of this vulnerability is substantial, encompassing both data compromise and service disruption. Beyond the loss of confidentiality and integrity, the attacker possesses the capability to cause a partial denial of service against Helidon services. This availability impact implies that malicious requests can consume excessive resources or trigger errors that degrade system performance for legitimate users. The CVSS 3.1 base score of 9.4 reflects this broad scope of damage, highlighting risks across confidentiality, integrity, and availability vectors. Such a high severity rating underscores the urgent need for remediation to prevent potential data exfiltration, persistent backdoors via modified configurations or code, and operational downtime that could affect downstream business processes dependent on Oracle Fusion Middleware services.
In terms of industry standards classification, this vulnerability aligns with CWE-287 Improper Authentication, as it allows unauthenticated access to critical functions. The ability to modify data corresponds to CWE-601 URL Redirection to Untrusted Site or CWE-94 Code Injection depending on the specific mechanism exploited within the web server logic. Additionally, the unauthorized creation and deletion of resources may relate to CWE-732 Incorrect Permission Assignment for Critical Resource if the flaw stems from default insecure permissions in the deployment configuration. From an adversary behavior perspective, this aligns with MITRE ATT&CK techniques such as T1059 Command and Scripting Interpreter or T1486 Data Encrypted for Impact if used to deploy ransomware via modified files, though primarily it represents initial access and privilege escalation through weak authentication controls.
Mitigation strategies must prioritize immediate isolation of the affected Helidon instance from untrusted networks until a patch is applied. Oracle should be consulted for available updates or patches that address this specific flaw in version 4.5.0. In the interim, network-level defenses such as Web Application Firewalls can be configured to block suspicious HTTP patterns associated with exploitation attempts. Implementing strict access control lists and ensuring that administrative interfaces are not exposed directly to the internet is critical. Regular security audits of Helidon configurations should also be conducted to verify that no other endpoints suffer from similar authentication deficiencies, thereby reducing the overall attack surface for Oracle Fusion Middleware deployments.