CVE-2026-73897 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).
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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 weakness in how the web server handles incoming HTTP requests without adequate validation or authentication checks. The core technical issue allows an unauthenticated attacker to exploit this deficiency by sending specially crafted network traffic over standard HTTP protocols. Because the vulnerability does not require user interaction or prior authentication, it presents a significant risk for automated exploitation across any system where Helidon is exposed to external networks.
From a technical perspective, the flaw enables unauthorized modifications and access to data managed by the Helidon application. Successful exploitation grants an attacker the ability to perform unauthorized updates, inserts, or deletions against accessible datasets, thereby compromising data integrity. Additionally, the vulnerability permits unauthorized read access to a subset of this data, which impacts confidentiality. This dual impact on both integrity and confidentiality distinguishes it from simple denial-of-service issues, as it allows for active manipulation and exfiltration of sensitive information stored within the application's scope.
The operational impact of this vulnerability is substantial due to its low complexity and lack of authentication requirements. An attacker with network access can leverage common web exploitation tools to probe for this weakness without needing credentials or complex social engineering tactics. The resulting compromise allows for data tampering, which could lead to business logic errors, financial loss, or reputational damage depending on the nature of the stored data. Furthermore, unauthorized read access may expose personally identifiable information or proprietary secrets, leading to potential regulatory violations under frameworks such as GDPR or HIPAA if applicable data is exposed.
In terms of industry classification standards, this vulnerability aligns with CWE-287, which describes Improper Authentication, and potentially CWE-918 for Server-Side Request Forgery if the exploitation involves manipulating server-side requests to access internal resources. The attack vector corresponds to MITRE ATT&CK technique T1059, Command and Scripting Interpreter, or more broadly T1190, Exploit Public-Facing Application, as it targets a web service accessible over the network. The CVSS 3.1 base score of 6.5 reflects these factors with a vector string indicating Network Attack Vector, Low Complexity, No Privileges Required, and no User Interaction required, resulting in Low Confidentiality and Integrity impacts but no direct Availability impact.
Mitigation strategies should prioritize immediate patching to the latest supported version of Oracle Fusion Middleware Helidon where this flaw has been addressed by Oracle engineering teams. In environments where upgrading is not immediately feasible, network-level controls such as Web Application Firewalls can be configured to inspect HTTP traffic for patterns indicative of exploitation attempts targeting the Imperative Web Server endpoint. Additionally, implementing strict input validation and output encoding at the application layer may help mitigate similar flaws in custom code built upon Helidon. Access control lists should also be reviewed to ensure that only necessary services are exposed externally, reducing the attack surface available to unauthenticated actors.