CVE-2026-83054 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).
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Analysis
by VulDB Data Team • 09/16/2026
The Oracle Internet Directory component within the Oracle Fusion Middleware suite is susceptible to a critical security flaw that permits unauthenticated remote attackers to gain complete control over the affected system. This vulnerability resides specifically in the OID LDAP Server, which serves as the directory service for managing user identities and access policies across enterprise environments. The issue affects specific supported versions of the software, namely 12.2.1.4.0 and 14.1.2.1.0, indicating that even recently patched or maintained releases are not immune to this particular defect. The nature of the flaw allows an attacker who possesses network access to exploit the vulnerability without requiring any form of authentication credentials, thereby bypassing standard security controls designed to restrict directory operations to authorized users only.
From a technical perspective, the exploitation vector relies on LDAP protocol interactions, which are fundamental to how Oracle Internet Directory processes queries and updates for user data. The flaw likely involves improper validation or handling of specific LDAP requests that allow an unauthenticated entity to execute arbitrary commands or manipulate internal state in ways not intended by the system architecture. Because the vulnerability allows for a takeover of the service, it implies that the attacker can escalate privileges from a non-existent account to full administrative control over the directory server. This level of access enables the modification of critical identity data, including user attributes, group memberships, and authentication mechanisms, effectively allowing the adversary to rewrite the security posture of the entire organization dependent on this central identity store.
The operational impact of such a vulnerability is severe, as reflected by its CVSS 3.1 Base Score of 9.8 out of 10. This high severity rating underscores that the compromise affects confidentiality, integrity, and availability equally. In terms of confidentiality, an attacker can exfiltrate sensitive personal identifiable information stored within the directory. Regarding integrity, the ability to alter user records means attackers can create backdoor accounts or modify existing permissions to maintain persistent access while evading detection by security monitoring tools. For availability, the takeover could facilitate denial-of-service conditions that disrupt business operations reliant on single sign-on and identity verification services. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) confirms that no user interaction is required, network access is sufficient, and the attack complexity is low, making it a high-risk threat for any internet-facing or internally accessible LDAP service running these versions.
This vulnerability aligns with several common weakness enumerations defined by industry standards. It corresponds closely to CWE-287, which describes Improper Authentication, as the system fails to verify identity before processing sensitive requests. Additionally, because it leads to a complete takeover of the application or server, it maps to CWE-269, an Improvement in Privileges issue where unprivileged actors gain elevated access. In terms of offensive security tactics, this exploit falls under MITRE ATT&CK technique T1078, Valid Accounts, although here applied to invalid or non-existent accounts due to the authentication bypass nature. It also relates to T1546, Event Triggered Execution, if the vulnerability allows for code execution through specific LDAP operations that trigger backend processes without proper sandboxing.
Mitigation strategies must prioritize immediate remediation given the high severity and ease of exploitation. The primary defense is to apply the latest security patches provided by Oracle for versions 12.2.1.4.0 and 14.1.2.1.0, ensuring that the specific code paths involved in LDAP request processing are updated with the vendor's fixes. In environments where patching cannot be implemented immediately due to operational constraints, network-level controls should be enforced. This includes restricting access to the OID LDAP Server ports using firewall rules or Access Control Lists so that only trusted IP addresses can initiate connections. Furthermore, implementing strict input validation and sanitization on any intermediate proxies or load balancers handling LDAP traffic may help mitigate exploitation attempts by filtering malformed requests before they reach the vulnerable server component. Regular auditing of directory access logs is also recommended to detect anomalous patterns indicative of attempted unauthenticated exploits.