CVE-2026-73893 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 authorization checks. The nature of this defect allows an unauthenticated attacker to exploit the system remotely over the network via standard HTTP protocols. Because no prior authentication is required and the attack complexity is low, the barrier for exploitation is significantly reduced, making it a high-risk issue for any deployment where Helidon is exposed to external networks or internal segments that are not strictly segmented from potential threat actors.
From a technical perspective, this vulnerability enables unauthorized modifications to data accessible by the Helidon application. Specifically, an attacker can perform unauthorized update, insert, and delete operations against certain datasets managed by the service. In addition to these integrity violations, the flaw also permits unauthorized read access to a subset of the same data pool. This dual impact on both confidentiality and integrity indicates that the underlying mechanism likely fails to enforce proper role-based access controls or input validation at the web server layer before requests are processed by backend application logic. The absence of such checks allows malicious payloads to manipulate database states or retrieve sensitive information directly through crafted HTTP requests, bypassing intended security boundaries.
The operational impact of this vulnerability is substantial due to its CVSS 3.1 base score of 6.5, which classifies it as a medium-severity issue with significant potential for harm. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N) confirms that the attack is network-based, requires low complexity, and demands no user interaction or privileges. While availability remains unaffected according to this specific assessment, the compromise of data confidentiality and integrity poses severe risks including data leakage, unauthorized transaction manipulation, and potential downstream corruption of dependent systems. For organizations relying on Helidon for mission-critical applications, such a flaw can lead to regulatory non-compliance, financial loss, and reputational damage resulting from exposed sensitive records or altered business logic outcomes.
To mitigate this risk, immediate action is required to apply the latest security patches provided by Oracle for Helidon version 4.5.0. Organizations should verify their deployment configurations to ensure that no unpatched instances are accessible via HTTP without additional protective layers such as Web Application Firewalls (WAF) or reverse proxies with strict access control lists. Implementing defense-in-depth strategies is crucial; this includes enforcing authentication at the application layer even if the web server component has gaps, validating all inputs rigorously to prevent injection-style attacks that might exploit similar weaknesses, and restricting network exposure so that only authorized IP ranges can reach the service endpoints. Regular vulnerability scanning and penetration testing should be conducted to identify any residual exposures or misconfigurations that could facilitate exploitation of this class of vulnerabilities in future updates.