CVE-2026-73901 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. Difficult to exploit 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 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/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 4.5.1. This security flaw is characterized by a difficulty in exploitation that requires an unauthenticated attacker to have network access via HTTP to successfully compromise the system. The nature of this weakness suggests a fundamental issue in how the web server processes incoming requests or manages state without proper authentication checks for specific endpoints or operations. Such vulnerabilities often stem from improper validation of input parameters, missing authorization controls on sensitive API routes, or logic errors that allow attackers to bypass intended security boundaries. In enterprise environments where Helidon is deployed as part of a larger microservices architecture, the web server acts as a critical entry point, making any lapse in its access control mechanisms particularly significant for overall system integrity.
The operational impact of this vulnerability centers on unauthorized data manipulation and exposure. Successful exploitation allows an attacker to perform unauthorized updates, inserts, or deletes against accessible Helidon data, which directly compromises the integrity of the information stored or processed by the application. Furthermore, the vulnerability grants unauthorized read access to a subset of this data, thereby impacting confidentiality. This dual impact aligns with common patterns seen in broken object level authorization flaws where an attacker can interact with resources they do not own or have permission to view. The ability to modify and exfiltrate data without authentication poses a severe risk to business operations, potentially leading to data corruption, loss of customer trust, and regulatory non-compliance depending on the sensitivity of the affected datasets.
From a technical classification perspective, this vulnerability maps closely to CWE-862 Missing Authorization, as it involves an attacker performing actions or accessing resources without being properly authenticated or authorized by the system. Additionally, given that the attack vector is network-based via HTTP and requires no user interaction, it relates to CWE-304 Missing Critical Authentication Step in a context where authentication should be enforced for specific sensitive operations. In terms of adversary tactics, this aligns with MITRE ATT&CK techniques such as T1078 Valid Accounts if the attacker leverages stolen credentials later, but primarily falls under initial access vectors that exploit misconfigured web servers or APIs to gain foothold in a network environment. The CVSS 3.1 base score of 4.8 reflects these moderate impacts on confidentiality and integrity with no impact on availability, indicating that while the system remains operational, its data security is severely compromised.
Mitigation strategies for this vulnerability must prioritize immediate patching if an updated version of Helidon is available from Oracle Fusion Middleware support channels. Organizations should also implement compensating controls such as web application firewalls to filter malicious HTTP requests and enforce strict authentication requirements on all API endpoints that were previously accessible without credentials. Network segmentation can further limit the attack surface by restricting direct HTTP access to internal services running Helidon 4.5.1 until a permanent fix is deployed. Continuous monitoring of server logs for anomalous patterns indicative of unauthorized data modifications or unusual read operations will aid in early detection and response, ensuring that any exploitation attempts are identified before significant damage occurs.