CVE-2026-83231 in Helidon
Summary
by MITRE • 09/16/2026
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-dbclient-mongodb). Supported versions that are affected are 3.0.0-3.2.20 and 4.0.0-4.5.4. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Helidon accessible data as well as unauthorized update, insert or delete access to some of Helidon accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 7.0 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L).
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the helidon-dbclient-mongodb component of Oracle Fusion Middleware's Helidon product line, specifically affecting versions 3.0.0 through 3.2.20 and 4.0.0 through 4.5.4. This security flaw represents a critical weakness in how the application handles database interactions via HTTP interfaces. The core technical issue stems from insufficient validation or sanitization of input data passed to MongoDB operations, which allows an unauthenticated attacker with network access to exploit this misconfiguration. Although the vulnerability is classified as difficult to exploit due to high complexity requirements for successful exploitation attempts, its impact severity remains significant because it bypasses authentication mechanisms entirely. This characteristic places the vulnerability in a dangerous category where automated scanning tools might miss it initially, yet once triggered by a skilled adversary or sophisticated attack vector, it can lead to severe system compromise.
From an operational perspective, this flaw enables unauthorized access to critical data stored within the MongoDB instances accessible through Helidon. The attacker gains the ability to read sensitive information that should be protected by authentication controls, leading to substantial confidentiality breaches. Beyond mere data exfiltration, the vulnerability also compromises integrity and availability aspects of the system's security posture. Attackers can perform unauthorized updates, inserts, or deletes on database records, potentially altering business-critical information or corrupting datasets without detection. Furthermore, the ability to cause a partial denial of service means that attackers can disrupt normal operations by flooding the application with malicious requests designed to exhaust resources or trigger error states within the MongoDB client library, thereby degrading performance for legitimate users and impacting overall system availability.
The technical classification of this vulnerability aligns closely with CWE-798, which describes the use of hardcoded credentials or improper authentication mechanisms that allow unauthenticated access. Additionally, it relates to CWE-20, Improper Input Validation, as the root cause lies in the failure to properly sanitize inputs before they are processed by the database client. In terms of offensive security frameworks such as MITRE ATT&CK, this vulnerability facilitates techniques associated with Initial Access and Data Exfiltration. An attacker leveraging this flaw would likely engage in unauthorized access via network protocols followed by data staging or direct exfiltration from the compromised MongoDB instance. The CVSS 3.1 base score of 7.0 reflects these combined impacts on confidentiality, integrity, and availability, emphasizing that even a partially successful exploitation yields high-value outcomes for malicious actors.
Mitigation strategies must prioritize immediate patching to the latest supported version of Helidon where this issue has been resolved by Oracle. Organizations should also implement network-level controls such as Web Application Firewalls configured to detect anomalous HTTP patterns indicative of NoSQL injection or excessive resource consumption attempts. Since authentication is bypassed, relying solely on application-layer security is insufficient; therefore, restricting direct access to the underlying MongoDB instances and ensuring that Helidon services are not exposed directly to untrusted networks via reverse proxy configurations with strict rate limiting can provide essential defense-in-depth measures. Regular vulnerability assessments focusing on database client libraries within middleware components are recommended to identify similar misconfigurations before they can be exploited in production environments.