CVE-2026-83063 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 high privileged 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 7.2 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 09/16/2026
The Oracle Internet Directory component within the Oracle Fusion Middleware suite contains a critical security flaw that affects version 12.2.1.4.0 and version 14.1.2.1.0 of the OID LDAP Server. This vulnerability represents a significant risk to organizations relying on this directory service for identity management, authentication, and authorization processes across their enterprise infrastructure. The core issue lies in how the LDAP server handles specific requests from authenticated users with high privileges, allowing an attacker who has already gained network access and possesses elevated credentials to exploit internal processing errors or logic flaws within the application layer of the directory service.
From a technical perspective, this vulnerability is characterized by its ease of exploitation despite requiring high-privileged access initially. This suggests that while the attack vector requires authentication, the subsequent actions needed to trigger the flaw are straightforward and do not require complex chaining of multiple vulnerabilities or sophisticated social engineering tactics beyond initial credential theft. The attacker interacts with the LDAP service over a network connection, leveraging standard directory protocols to send malformed or specifically crafted requests that cause unintended behavior within the Oracle Internet Directory software. This could involve buffer overflow conditions, improper input validation leading to code execution, or logic flaws that bypass internal security controls, ultimately resulting in arbitrary command execution or complete system compromise under the context of the service account running the LDAP server.
The operational impact of a successful exploitation is severe, as indicated by the CVSS 3.1 Base Score of 7.2, which classifies this vulnerability as High severity. The vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) explicitly details that while the attack requires high privileges and local network access with no user interaction, it results in high impacts across all three pillars of information security confidentiality, integrity, and availability. A successful takeover of Oracle Internet Directory means an attacker gains control over a central repository of identities and credentials. This can lead to unauthorized access to sensitive corporate data stored within the directory, modification or deletion of critical identity records which disrupts business operations, and potentially using the compromised server as a pivot point for further lateral movement into other parts of the network that trust this directory service.
In terms of industry standard classifications, this vulnerability aligns with CWE-20 Improper Input Validation if the root cause involves malformed LDAP requests, or CWE-78 OS Command Injection if arbitrary commands are executed on the host system. From an offensive security perspective, such exploitation techniques fall under MITRE ATT&CK tactics related to Initial Access and Privilege Escalation, specifically leveraging valid credentials obtained through phishing or credential stuffing attacks to gain a foothold and then escalating privileges within the directory service environment. The requirement for high-privileged access indicates that this is not an unauthenticated remote code execution flaw but rather an abuse of legitimate administrative capabilities by compromised accounts.
Mitigation strategies must focus on both immediate remediation and long-term hardening. Oracle has likely released a patch or update addressing this specific vulnerability in the OID LDAP Server component, making the application of the latest security patches to all affected versions 12.2.1.4.0 and 14.1.2.1.0 the primary defense mechanism. Organizations should prioritize applying these updates as soon as they are verified for stability within their test environments. Additionally, since exploitation requires high-privileged network access, enforcing strict least privilege principles is critical. Administrators must ensure that service accounts running Oracle Internet Directory operate with minimal necessary permissions and that administrative LDAP bind credentials are protected using strong password policies and multi-factor authentication where possible. Network segmentation should be implemented to restrict direct LDAP port access (typically TCP 389 or 636) to only authorized management stations and application servers, reducing the attack surface available to potential attackers who may have compromised other systems on the network. Regular auditing of privileged account usage and monitoring for anomalous LDAP query patterns can also help in detecting attempted exploitation activities before they result in a full compromise.