CVE-2026-73904 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 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's Helidon product, specifically affecting version 4.5.1. This security flaw represents a significant risk to organizations relying on this framework for building microservices and cloud-native applications in Java environments. The core issue stems from insufficient input validation or access control mechanisms inherent in how the web server processes incoming HTTP requests. Because the vulnerability is easily exploitable, it does not require complex attack vectors or specific user interactions, allowing an unauthenticated attacker with network access to directly interact with the vulnerable service endpoints. This lack of authentication requirement means that any entity capable of reaching the server over the network can attempt to exploit this weakness without needing valid credentials, thereby lowering the barrier for entry significantly and increasing the likelihood of successful compromise in exposed environments.
From a technical perspective, the flaw allows an attacker to manipulate data integrity and confidentiality within the scope of Helidon's accessible resources. Successful exploitation enables unauthorized updates, inserts, or deletes against certain datasets managed by the application. This indicates that the vulnerability likely involves improper authorization checks on write operations, allowing malicious actors to alter stored information arbitrarily. Furthermore, the vulnerability grants unauthorized read access to a subset of data, suggesting that sensitive information can be exfiltrated even if full system control is not achieved. The combination of these capabilities points towards an insecure direct object reference or broken access control mechanism where the server fails to verify whether the requesting user has permission to perform specific actions on particular resources. This aligns with common patterns seen in web application vulnerabilities where state changes are permitted without adequate verification of user privileges relative to the target data objects.
The operational impact of this vulnerability is substantial, primarily due to its high exploitability and network accessibility. With a CVSS 3.1 Base Score of 6.5, classified as Medium severity, the risk is driven by low attack complexity and no required user interaction or authentication. The primary impacts are on Confidentiality and Integrity, with Availability remaining unaffected according to the provided vector string AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N. This means that while an attacker cannot necessarily crash the service or cause a denial of service, they can leak sensitive data and corrupt database records. For businesses using Helidon for critical business logic, this could lead to financial loss through fraudulent transactions if write operations are compromised, or reputational damage and regulatory penalties due to data breaches resulting from unauthorized reads. The ability to modify data without detection poses a long-term threat as corrupted data may persist until discovered, potentially affecting downstream systems that rely on accurate information.
To mitigate this risk, immediate action is required to patch the Helidon framework to a version where this vulnerability has been resolved by Oracle. Organizations should review their deployment configurations to ensure that sensitive endpoints are not exposed directly to untrusted networks without additional protective layers such as Web Application Firewalls or API gateways that enforce strict access controls and input validation. Implementing robust authentication and authorization mechanisms at the application level is critical, ensuring that every request is verified against user permissions before processing data modifications. Additionally, adopting a defense-in-depth strategy by limiting network exposure of development or staging environments where such vulnerabilities might be present can reduce the attack surface. Regular security assessments and code reviews focusing on access control logic will help prevent similar issues in future developments, aligning with industry standards like CWE-862 for missing authorization checks and MITRE ATT&CK techniques related to unauthorized data access and modification.