CVE-2026-73894 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 and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 7.3 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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 represents a critical weakness in how the web server handles incoming HTTP requests from unauthenticated actors. The core technical issue stems from insufficient input validation or improper access control mechanisms inherent to the imperative programming model used by this specific iteration of the framework. When an attacker sends specially crafted HTTP traffic, the application fails to properly sanitize inputs or verify permissions before processing them against backend data stores and system resources. This lack of rigorous boundary checking allows malicious payloads to bypass standard security controls, effectively granting the attacker a foothold within the server environment without requiring any form of authentication credentials.
The operational impact of this vulnerability is severe due to its broad scope across confidentiality, integrity, and availability domains. On the integrity front, an unauthenticated attacker can execute unauthorized update, insert, or delete operations against accessible data managed by Helidon. This capability allows for direct manipulation of application state, potentially leading to data corruption, injection attacks, or persistent backdoors within the database layer. Simultaneously, the vulnerability compromises confidentiality by permitting unauthorized read access to a subset of sensitive data stored or processed by the service. Attackers can exfiltrate proprietary information, user credentials, or other confidential assets depending on what is exposed through the vulnerable endpoints. Furthermore, the availability impact manifests as a partial denial of service condition. By exploiting this flaw, an attacker can consume excessive server resources such as CPU cycles, memory, or network bandwidth, thereby degrading performance for legitimate users and potentially causing service outages if the resource exhaustion is sustained or amplified.
From a classification perspective, this vulnerability aligns with Common Weakness Enumeration (CWE) categories related to improper input validation and broken access control. Specifically, it reflects weaknesses associated with CWE-20 Improper Input Validation and CWE-862 Missing Authorization, which are fundamental prerequisites for many remote code execution or data manipulation attacks. In the context of the MITRE ATT&CK framework, this vulnerability facilitates techniques such as T1190 Exploit Public-Facing Application and potentially T1537 Transfer Data to Cloud Account if exfiltration is involved. The attack vector requires network access via HTTP with low complexity and no user interaction, making it highly attractive for automated scanning tools and opportunistic attackers targeting internet-facing services running this specific version of Helidon.
Mitigation strategies must focus on immediate patching and defensive configuration adjustments. Oracle has likely released a patched version of the Helidon framework that addresses these input validation gaps and enforces stricter access controls within the Imperative Web Server component. Organizations should prioritize upgrading to the latest stable release where these security flaws have been remediated. In scenarios where an upgrade is not immediately feasible, network-level mitigations such as deploying a Web Application Firewall (WAF) can help filter out malicious HTTP payloads that exhibit patterns consistent with this vulnerability's exploitation vectors. Additionally, implementing strict rate limiting and connection throttling can mitigate the partial denial of service impact by preventing any single source from overwhelming server resources through repeated exploit attempts. Regular security audits and penetration testing should be conducted to verify that input sanitization is robust across all exposed endpoints and that default permissions are set to deny access unless explicitly granted.