CVE-2026-73881 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 low privileged 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 5.4 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/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 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 lowers the barrier for entry significantly, allowing attackers with minimal technical sophistication to interact directly with the application logic through standard network protocols.
The attack vector requires a low-privileged attacker who has established network connectivity to the target system via HTTP. This implies that the vulnerability does not require authentication or complex social engineering tactics to trigger. Once an attacker establishes this connection, they can manipulate request parameters in ways that bypass intended security boundaries. The lack of proper authorization checks allows these requests to execute operations that should be restricted based on user roles or permissions. Consequently, the system fails to distinguish between legitimate administrative actions and malicious exploitation attempts originating from lower-privilege accounts.
The operational impact of this vulnerability is characterized by both confidentiality and integrity breaches, as reflected in its CVSS 3.1 base score of 5.4. Successful exploitation grants an attacker unauthorized read access to a subset of data accessible by Helidon, leading to potential information disclosure. This could involve sensitive business logic, user credentials, or proprietary application states being exfiltrated without detection. Simultaneously, the vulnerability permits unauthorized updates, inserts, and deletes against accessible data stores. This integrity violation allows attackers to alter records, inject malicious content, or remove critical information, thereby compromising the reliability and trustworthiness of the entire service layer dependent on Helidon.
From a classification perspective, this flaw aligns with Common Weakness Enumeration (CWE) categories such as CWE-862 Missing Authorization and CWE-79 Improper Neutralization of Input During Web Page Generation if input validation is the root cause. In terms of adversary tactics, it maps to MITRE ATT&CK techniques related to Initial Access via valid accounts or services, followed by Data Exfiltration for confidentiality impacts and Impact through data manipulation for integrity violations. The combination of these factors creates a scenario where an attacker can pivot from simple network access to significant database compromise without needing elevated privileges initially.
Mitigation strategies must focus on immediate patching and architectural hardening. Organizations running Helidon version 4.5.0 should upgrade to the latest stable release provided by Oracle, as subsequent versions typically include patches for known authorization flaws in web server components. In addition to updating dependencies, developers should implement strict input validation routines that sanitize all user-supplied data before processing. Implementing robust access control lists (ACLs) and ensuring that every endpoint enforces role-based access controls can prevent low-privileged users from executing administrative functions. Furthermore, deploying a Web Application Firewall may help detect and block anomalous HTTP patterns associated with exploitation attempts while longer-term fixes are deployed.