CVE-2026-83061 in Internet Directory
Summary
by MITRE • 09/16/2026
Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.1.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via LDAP to compromise Oracle Internet Directory. Successful attacks of this vulnerability can result in takeover of Oracle Internet Directory. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Oracle Internet Directory component of Oracle Fusion Middleware, specifically affecting versions 12.2.1.4.0 and 14.1.2.1.0. This security flaw is classified as a critical severity issue with a CVSS 3.1 Base Score of 9.8, indicating that it poses an extreme risk to the confidentiality, integrity, and availability of affected systems. The vulnerability allows for unauthenticated exploitation by any attacker who possesses network access via the LDAP protocol. Because no authentication credentials are required to trigger this flaw, the barrier to entry is exceptionally low, enabling even novice attackers with basic networking knowledge to compromise the directory service infrastructure.
From a technical perspective, the core issue stems from improper validation or handling of input within the OID LDAP Server component. This deficiency permits an unauthenticated user to send specially crafted requests that exploit internal logic errors or memory management flaws. The absence of proper access controls at this layer means that malicious actors can bypass standard security mechanisms designed to restrict operations to authorized users only. Consequently, the attacker gains a foothold deep within the authentication and directory services architecture, which serves as the backbone for identity management across many enterprise environments relying on Oracle Fusion Middleware.
The operational impact of successfully exploiting this vulnerability is severe and comprehensive. As indicated by the high scores in confidentiality, integrity, and availability categories, an attacker can achieve complete takeover of the Oracle Internet Directory service. This level of compromise allows the adversary to read sensitive user credentials, modify directory entries to escalate privileges or create backdoor accounts, and disrupt services leading to denial of access for legitimate users. In a typical enterprise deployment where OID manages authentication for multiple applications and systems, this single point of failure can cascade into widespread system outages and unauthorized data exposure across the entire organization's digital estate.
This vulnerability aligns with Common Weakness Enumeration (CWE) categories such as CWE-287 Improper Authentication and CWE-94 Improper Control of Generation of Code or Command Injection, depending on the specific exploitation vector utilized by the attacker. In terms of the MITRE ATT&CK framework, this flaw facilitates initial access through network services that are not properly secured against unauthenticated interaction, potentially leading to privilege escalation and persistence within the environment if left unchecked. The ease of exploitation via standard LDAP ports makes it particularly dangerous in environments where these ports are exposed to internal or external networks without additional protective layers like Web Application Firewalls or strict firewall rules limiting access to trusted IP ranges only.
Mitigation strategies must prioritize immediate patching by Oracle, as this is a vendor-supplied fix for the underlying code defect. Organizations should apply the latest security patches provided by Oracle for their specific version of Fusion Middleware immediately upon availability. In scenarios where patching cannot be implemented instantly due to operational constraints or testing requirements, temporary mitigations are essential. These include restricting network access to LDAP ports using firewall rules to allow connections only from known and trusted application servers or management stations. Additionally, implementing strict input validation at the perimeter level through reverse proxies can help filter out malformed requests before they reach the vulnerable OID service components. Regular auditing of directory services for anomalous activity patterns associated with unauthenticated probing should also be conducted to detect potential exploitation attempts early in the kill chain.