CVE-2026-73892 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. 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).
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
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 without proper authentication or input validation mechanisms. The core technical issue stems from an insufficient access control implementation that allows unauthenticated actors to interact with internal data structures and endpoints that should be restricted. By exploiting this misconfiguration, an attacker can bypass standard authorization checks, effectively treating protected resources as public-facing interfaces accessible over the network via HTTP protocols.
From a technical perspective, the vulnerability enables unauthorized modification of Helidon's accessible data through update, insert, or delete operations. This indicates a failure in enforcing integrity controls on state-changing actions initiated by external clients. Simultaneously, the flaw permits unauthorized read access to a subset of sensitive information stored within the application context. The combination of these capabilities suggests that the web server fails to properly isolate user sessions or validate request origins before executing data manipulation commands. This lack of strict separation between authenticated administrative functions and public-facing endpoints creates an attack surface where malicious actors can alter system state and exfiltrate confidential records without prior credentials.
The operational impact of this vulnerability is significant, as it compromises both the confidentiality and integrity aspects of the CIA triad for applications relying on Helidon 4.5.0. Attackers with network access to the vulnerable service can manipulate application data, potentially leading to business logic errors, data corruption, or persistent backdoors depending on how the affected endpoints are utilized within the broader Fusion Middleware architecture. The ability to read a subset of accessible data further exacerbates the risk by exposing proprietary information, user details, or internal system configurations that could facilitate more advanced lateral movement attacks within an enterprise environment.
This vulnerability aligns with CWE-284 Improper Access Control and CWE-918 Server-Side Request Forgery (SSRF) if the read access involves fetching external resources, though primarily it reflects a failure in authorization logic often categorized under CWE-862 Missing Authorization. In terms of offensive security frameworks such as MITRE ATT&CK, this behavior corresponds to techniques involving unauthorized data access and potential persistence through data manipulation, falling under tactics like Initial Access if used for entry or Impact if focused on data destruction. The CVSS 3.1 base score of 6.5 reflects the medium severity driven by network accessibility, low complexity, and lack of required privileges, emphasizing that no user interaction is needed to exploit this flaw.
To mitigate this risk, organizations running Helidon version 4.5.0 should immediately apply the latest security patches provided by Oracle for Fusion Middleware. It is critical to ensure that all web server components are updated to a version where access control lists and authentication middleware have been hardened against unauthenticated requests. Additionally, implementing defense-in-depth strategies such as Web Application Firewalls (WAF) can help filter malicious HTTP payloads before they reach the application layer. Regular security audits focusing on API endpoint authorization logic and strict enforcement of role-based access controls are recommended to prevent similar vulnerabilities in future deployments.