CVE-2026-73906 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 read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 security flaw represents a critical gap in access control mechanisms that governs how unauthenticated users interact with the web server interface via HTTP protocols. The core technical issue stems from an insufficient validation or authorization check during request processing, which allows external actors to bypass standard authentication requirements. By leveraging this weakness, an attacker can exploit the misconfiguration to gain unauthorized read access to a specific subset of data accessible by the Helidon application. This indicates that while the vulnerability does not permit full system compromise or arbitrary code execution, it exposes sensitive internal states or configuration details that should remain restricted to authenticated administrative users or authorized service accounts.
From an operational perspective, this vulnerability poses a moderate risk due to its ease of exploitation and network accessibility. The CVSS 3.1 base score of 5.3 reflects the significant impact on confidentiality while noting the absence of integrity or availability impacts in the current assessment vector. An unauthenticated attacker with basic network connectivity can exploit this flaw without requiring user interaction, making it particularly dangerous in internet-facing deployments where Helidon serves as a front-end gateway or API server. The successful exploitation leads to information disclosure, potentially revealing internal application logic, sensitive configuration parameters, or other data elements that are not intended for public consumption. This type of exposure can serve as reconnaissance material for further attacks, allowing adversaries to map the attack surface and identify additional entry points within the broader Oracle Fusion Middleware ecosystem.
In terms of industry standard classifications, this vulnerability aligns with CWE-284 Improper Access Control, specifically relating to insufficient authorization checks that allow unauthorized data retrieval. It also maps to MITRE ATT&CK technique T1078 Valid Accounts if the attacker leverages default or weak credentials, though in this specific case, it is more accurately described as an unauthenticated access flaw akin to CWE-200 Information Exposure. The attack vector AV:N indicates network-based exploitation, while AC:L and UI:N suggest that no complex conditions or user interaction are required, amplifying the severity of the risk for automated scanning tools and opportunistic attackers.
To mitigate this vulnerability, immediate remediation is recommended by applying the latest security patches provided by Oracle for Helidon version 4.5.0. Organizations should verify their deployment configurations to ensure that sensitive endpoints are not exposed via HTTP without proper authentication middleware or reverse proxy protections. Implementing strict access control lists and ensuring that all administrative interfaces require strong, multi-factor authentication can further reduce the risk surface. Additionally, network segmentation strategies should be employed to limit direct internet exposure of Helidon instances where possible, restricting access to trusted internal networks only until the patch is fully deployed across the environment.