CVE-2026-83337 in Middleware Common Libraries and Tools
Summary
by MITRE • 09/16/2026
Vulnerability in the Oracle Middleware Common Libraries and Tools product of Oracle Fusion Middleware (component: Remote Diagnostic Agent). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0 and 15.1.1.0.0. Easily exploitable vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Middleware Common Libraries and Tools executes to compromise Oracle Middleware Common Libraries and Tools. Successful attacks of this vulnerability can result in takeover of Oracle Middleware Common Libraries and Tools. CVSS 3.1 Base Score 7.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Remote Diagnostic Agent component of Oracle Middleware Common Libraries and Tools, a critical subsystem used for monitoring and troubleshooting Oracle Fusion Middleware environments. This flaw affects specific supported versions including 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0. The Remote Diagnostic Agent is designed to collect diagnostic data from running middleware instances for analysis by Oracle support or internal administrators. However, the implementation contains a security flaw that allows an attacker with low privileges on the underlying infrastructure where the agent executes to compromise the integrity of the Middleware Common Libraries and Tools. This represents a significant risk because it bypasses traditional network-based perimeter defenses, relying instead on local access which is often more difficult to monitor comprehensively in complex enterprise environments.
From a technical perspective, this vulnerability enables an attacker who has already gained low-privileged logon access to the host system to escalate their privileges or execute arbitrary code within the context of the Oracle Middleware process. The exploitability is rated as easy due to the lack of required user interaction and the relatively straightforward nature of the attack vector once local access is established. By leveraging this flaw, an attacker can achieve complete takeover of the affected component. This capability aligns with Common Weakness Enumeration (CWE) categories such as CWE-269 Improper Privilege Management or CWE-78 OS Command Injection, depending on the specific mechanism exploited within the diagnostic agent's codebase. The vulnerability allows for unauthorized modification of system state and execution of commands that should be restricted to higher-level administrative accounts, effectively breaking the isolation boundaries intended by the operating system and application layer security controls.
The operational impact of this vulnerability is severe, as indicated by a CVSS 3.1 Base Score of 7.8, which classifies it as High severity. The vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) confirms that the attack requires local access but has low complexity and no user interaction requirements. Most critically, the impact on Confidentiality, Integrity, and Availability is rated as High across all three axes. This means an attacker can not only read sensitive data processed or stored by the middleware but also modify configurations, inject malicious logic into diagnostic reports, or disrupt service availability by crashing the agent process. In a production environment, this could lead to unauthorized disclosure of proprietary business logic embedded in applications running on WebLogic Server, manipulation of transaction logs, or denial of service that impacts downstream dependent systems relying on stable middleware performance.
This vulnerability maps directly to MITRE ATT&CK techniques related to Local Privilege Escalation and Command and Control via system utilities. Specifically, it resembles T1068 Exploitation for Privilege Escalation where an attacker leverages a software flaw to gain higher-level permissions. Furthermore, because the Remote Diagnostic Agent is often used to transmit data out of the network, compromising it could potentially facilitate lateral movement or exfiltration if the agent's outbound communication channels are abused. The presence of this vulnerability in widely deployed versions underscores the importance of patch management and strict access control policies for middleware infrastructure hosts.
To mitigate this risk, organizations must apply the latest security patches provided by Oracle that address the flaw within the Remote Diagnostic Agent component immediately upon availability. It is essential to verify which specific version of Oracle Fusion Middleware is running across all enterprise assets and prioritize remediation for those falling into the affected ranges listed above. In addition to patching, implementing strict least-privilege principles on servers hosting middleware components can reduce the attack surface. Administrators should ensure that only authorized service accounts have local access rights to these hosts and disable unnecessary user logon capabilities where possible. Network segmentation strategies should also be reviewed to limit lateral movement opportunities in case an attacker gains initial foothold through other vectors, ensuring that even if this vulnerability is exploited, the blast radius remains contained within isolated segments of the infrastructure. Regular auditing of process execution and file integrity monitoring can help detect unauthorized modifications or suspicious activities originating from compromised middleware components before significant damage occurs.