CVE-2026-73913 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 security flaw represents a significant risk to organizations relying on this framework for building microservices and cloud-native applications in Java environments. The core issue stems from insufficient input validation or access control mechanisms within the HTTP request handling logic of the web server. Because the vulnerability is easily exploitable by low-privileged attackers with network access, it indicates that no complex authentication bypasses or high-level privileges are required to trigger the exploit. An attacker merely needs to be able to send HTTP requests to the affected service endpoint, which significantly lowers the barrier for entry in most enterprise networks where internal services often have broader accessibility than external-facing ones.
The technical nature of this flaw allows an adversary to manipulate data integrity and confidentiality within the scope of Helidon accessible resources. Specifically, successful exploitation enables unauthorized updates, inserts, or deletes against certain datasets managed by the application. This aligns with CWE-269 Improper Privilege Management and potentially CWE-798 Use of Hard-coded Credentials if authentication is bypassed entirely, though the primary impact described points toward a lack of proper authorization checks on data modification operations. Furthermore, the vulnerability permits unauthorized read access to a subset of accessible data, which corresponds directly to CWE-200 Exposure of Sensitive Information to an Unauthorized Actor. The combination of these capabilities suggests that the web server fails to properly enforce role-based or attribute-based access controls when processing specific HTTP methods such as POST, PUT, DELETE, and GET against vulnerable endpoints.
From a strategic perspective, this vulnerability maps closely to MITRE ATT&CK techniques related to Data Injection and Data Exfiltration. The ability to perform unauthorized inserts and updates can be leveraged for data poisoning or lateral movement within the application logic, while read access facilitates reconnaissance and theft of sensitive business information. Given that Helidon is often used in high-throughput microservice architectures, an attacker could potentially chain this vulnerability with others to escalate privileges or disrupt service availability indirectly by corrupting critical configuration or user data stores connected to the backend databases. The operational impact includes potential regulatory non-compliance due to unauthorized data exposure and loss of trust from clients whose sensitive information may be compromised.
The CVSS 3.1 base score of 5.4 reflects a medium severity rating, driven primarily by network accessibility (AV:N), low attack complexity (AC:L), and the requirement for only low privileges (PR:L). The absence of user interaction (UI:N) and system scope unchanged (S:U) further contextualizes the risk as one that can be automated and executed remotely without social engineering. While availability is not directly impacted according to the vector, the integrity and confidentiality impacts are substantial enough to warrant immediate remediation efforts. Organizations must assess whether their Helidon deployments expose these specific endpoints publicly or within untrusted network segments.
Mitigation strategies should focus on applying the latest security patches provided by Oracle for Helidon version 4.5.0 as soon as they become available, ensuring that all dependencies are updated to versions where this flaw has been resolved. In the interim, if patching is not immediately feasible, implementing strict input validation and output encoding at the application layer can help mitigate injection-based aspects of the vulnerability. Additionally, deploying a Web Application Firewall (WAF) with rulesets tuned for Helidon traffic patterns may block exploit attempts by filtering malformed HTTP requests or enforcing stricter access control policies before they reach the vulnerable server component. Network segmentation should also be reviewed to ensure that low-privileged accounts do not have unnecessary network paths to critical microservice endpoints, thereby reducing the attack surface available to potential adversaries.