CVE-2026-73867 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 3.2.18. 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 Helidon, specifically affecting version 3.2.18. This security flaw represents a critical weakness in how the web server processes incoming HTTP requests before they are routed to application logic or handled by internal middleware layers. The core technical issue stems from insufficient validation and sanitization mechanisms applied to user-supplied input data within the request handling pipeline. Because this component serves as the primary entry point for external traffic, any deficiency in its parsing or routing logic can be leveraged by an attacker to manipulate server behavior without requiring prior authentication credentials.
The operational impact of this vulnerability is significant due to its high exploitability and lack of required user interaction. An unauthenticated attacker with network access via HTTP can easily trigger the flaw, leading to a compromise of data integrity and confidentiality within the Helidon environment. Specifically, successful exploitation allows for unauthorized updates, inserts, or deletes against accessible data stores managed by the application. This indicates that the vulnerability likely facilitates an injection-based attack vector where malicious payloads are executed in the context of the server process, granting the attacker write privileges to underlying databases or file systems. Furthermore, the vulnerability also permits unauthorized read access to a subset of Helidon-accessible data, suggesting potential information disclosure through error handling leaks or improper query construction that exposes sensitive records not intended for public consumption.
From a classification perspective, this issue aligns with Common Weakness Enumeration (CWE) categories such as CWE-94 Improper Control of Generation of Code Command Injection and CWE-200 Exposure of Sensitive Information to an Unauthorized Actor. The attack pattern is consistent with techniques documented in the MITRE ATT&CK framework, particularly T1190 Exploit Public-Facing Application and potentially T1059 Command and Scripting Interpreter if server-side code execution is achieved through injection payloads. The CVSS 3.1 base score of 6.5 reflects a medium severity rating driven by network accessibility, low complexity, and the absence of required privileges for the attacker. However, the specific impacts on confidentiality and integrity elevate the risk profile significantly in production environments where data trustworthiness is paramount.
Mitigation strategies must focus on immediate remediation through patching as well as defensive architectural adjustments. Oracle has released updates addressing this flaw; therefore, upgrading Helidon to a version later than 3.2.18 that includes the security fix is the primary recommendation. In scenarios where immediate patching is not feasible, organizations should implement strict input validation and output encoding at the application layer to neutralize injection attempts before they reach the vulnerable server component. Additionally, deploying Web Application Firewalls (WAFs) with rulesets tuned for common injection patterns can provide a temporary buffer against exploitation. Network segmentation should also be reviewed to ensure that Helidon instances are not directly exposed to untrusted networks without proper authentication gateways or reverse proxy configurations that enforce access controls at the perimeter level.