CVE-2026-83488 in Helidon
Summary
by MITRE • 09/16/2026
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-microprofile-security). Supported versions that are affected are 4.0.0-4.5.4. 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 • 09/16/2026
The identified vulnerability resides within the helidon-microprofile-security component of Oracle Fusion Middleware, specifically affecting Helidon versions ranging from 4.0.0 through 4.5.4. This security flaw represents a significant risk to applications built on this framework due to its potential for exploitation by low-privileged attackers who possess network access via HTTP protocols. The core technical issue stems from insufficient validation or authorization checks within the microprofile-security module, which is responsible for handling authentication and authorization logic in Helidon-based services. When an attacker interacts with vulnerable endpoints over a standard HTTP connection, they can bypass intended security controls to manipulate data integrity and confidentiality without requiring elevated privileges or user interaction.
From a technical perspective, this vulnerability allows an adversary to perform unauthorized updates, inserts, or deletes against accessible data stores associated with the Helidon application. Furthermore, it grants the ability to read sensitive information that should remain restricted based on the attacker's privilege level. This behavior is characteristic of broken access control mechanisms where role-based permissions are not strictly enforced during request processing. The lack of proper separation between administrative functions and standard user operations enables a low-privileged entity to execute actions typically reserved for higher-level accounts or system administrators, thereby undermining the fundamental security principle of least privilege.
The operational impact of this vulnerability is substantial, as it directly compromises both the confidentiality and integrity aspects of data managed by the affected applications. Unauthorized read access exposes sensitive business logic, user credentials, or proprietary information to external parties, leading to potential data breaches and regulatory non-compliance. Simultaneously, unauthorized write operations such as inserts, updates, and deletes can corrupt database records, alter application state in malicious ways, or introduce backdoors into the system infrastructure. These actions disrupt service availability indirectly by degrading data quality and trustworthiness, even though direct denial of service is not explicitly listed in the CVSS metrics for this specific vector.
In terms of industry standard classification, this vulnerability aligns with CWE-269 Improper Privilege Assignment or CWE-862 Missing Authorization, depending on whether the flaw lies in assigning incorrect roles to users or failing to check permissions before executing actions. It also maps closely to MITRE ATT&CK technique T1078 Valid Accounts, as attackers leverage legitimate but low-level credentials to gain unauthorized access to resources. The CVSS 3.1 base score of 5.4 reflects a medium severity level, driven by the network-based attack vector (AV:N), low complexity (AC:L), and lack of user interaction (UI:N). However, the requirement for local privilege (PR:L) indicates that while the attacker does not need admin rights initially, they must have some form of authenticated access to exploit this flaw.
Mitigation strategies should prioritize immediate patching by upgrading Helidon to a version beyond 4.5.4 where these security controls are reinforced. For environments unable to upgrade immediately, implementing strict input validation and enforcing robust role-based access control policies at the application layer can help mitigate risks. Network segmentation and web application firewalls may also provide an additional layer of defense by filtering malicious HTTP requests before they reach the vulnerable component. Continuous monitoring for anomalous data modification patterns is recommended to detect potential exploitation attempts in real-time, ensuring rapid response to any security incidents arising from this vulnerability.