CVE-2026-73911 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 flaw represents a significant security deficiency in how the web server handles incoming HTTP requests from clients with low privileges. The core technical issue involves an insufficient validation or sanitization mechanism that allows attackers to manipulate data inputs in ways that bypass intended access controls. Because the vulnerability is easily exploitable and requires only network access via HTTP, it presents a high risk for remote exploitation without the need for user interaction or complex preconditions beyond basic connectivity.
From a technical perspective, this flaw aligns with CWE-94 Improper Control of Generation of Code (Code Injection) or potentially CWE-862 Missing Authorization, depending on the specific implementation details of how data is processed and persisted by the Helidon framework. The attacker leverages standard HTTP protocols to send crafted requests that exploit weaknesses in the server's request parsing logic. By manipulating these inputs, an adversary can trick the application into executing unintended operations or accessing restricted resources. This type of vulnerability often stems from a failure to properly separate user-supplied data from system commands or database queries, leading to unauthorized modifications or extractions of information stored within the Helidon accessible datasets.
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 enables a low-privileged attacker to gain unauthorized read access to a subset of data managed by Helidon, compromising sensitive information that should remain confidential. Furthermore, the attacker can perform unauthorized updates, inserts, or deletes against accessible data structures. This integrity violation means that critical business logic or user-generated content could be altered, corrupted, or removed without authorization, potentially leading to service disruption, financial loss, or reputational damage for organizations relying on Oracle Fusion Middleware Helidon for their web applications.
In terms of threat modeling and industry standards, this vulnerability maps closely to the MITRE ATT&CK technique T1059 Command and Scripting Interpreter if code injection is involved, or T1213 Data from Information Repositories if data exfiltration occurs. The attack vector falls under Network (AV:N) with Low Complexity (AC:L), requiring no user interaction (UI:N) but necessitating low privileges (PR:L). This profile suggests that while the attacker does not need high-level system access, they must have some level of authenticated or network-accessible presence within the environment to launch effective attacks. The lack of availability impact indicates that immediate service denial is not a primary concern with this specific flaw, though secondary effects could lead to instability if data corruption causes application crashes.
To mitigate this vulnerability, organizations running Helidon version 4.5.0 should prioritize applying the latest security patches provided by Oracle as soon as they are available in official release channels. Immediate remediation involves upgrading to a patched version where the input validation and authorization checks have been strengthened. In addition to patching, administrators should implement defense-in-depth strategies such as deploying Web Application Firewalls (WAFs) configured with rulesets designed to detect and block injection patterns or unauthorized data manipulation attempts. It is also critical to enforce strict least-privilege principles for application accounts and database connections used by Helidon, ensuring that even if an attacker succeeds in exploiting the vulnerability, their ability to modify or delete sensitive records is restricted. Regular security audits and code reviews focusing on HTTP request handling can further reduce the risk of similar flaws emerging in future updates.