CVE-2026-83034 in WebCenter Sites
Summary
by MITRE • 09/16/2026
Vulnerability in the Oracle WebCenter Sites product of Oracle Fusion Middleware (component: WebCenter Sites). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle WebCenter Sites. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle WebCenter Sites accessible data. CVSS 3.1 Base Score 7.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Oracle WebCenter Sites component of the Oracle Fusion Middleware suite, specifically affecting versions 12.2.1.4.0 and 14.1.2.0.0. This security flaw is classified as a critical information disclosure issue that allows an unauthenticated attacker to compromise the integrity and confidentiality of the application data. The vulnerability stems from improper access control mechanisms within the HTTP handling subsystem, which fails to adequately verify user privileges before processing requests for sensitive resources. Because the attack vector requires only network access via standard HTTP protocols and does not necessitate any form of authentication or user interaction, it presents a significant risk to organizations relying on this platform for content management and digital experience delivery. The ease of exploitation means that automated scanning tools can readily identify and exploit this weakness in vulnerable environments without requiring complex payload construction or social engineering tactics.
From a technical perspective, the flaw aligns with CWE-284, which describes Improper Access Control, specifically where access control permissions are not properly enforced for sensitive data objects. The vulnerability allows remote attackers to retrieve critical internal data that should be restricted to authenticated administrators or specific user roles. This behavior is consistent with ATT&CK technique T1078, Valid Accounts, although in this case the attacker does not need valid credentials initially; rather, they exploit a misconfiguration that effectively grants them unauthorized access as if they were an authorized entity. The lack of proper authentication checks on certain endpoints or API calls within WebCenter Sites enables the extraction of configuration details, user lists, or other proprietary information stored by the application. This exposure can serve as a stepping stone for further attacks, such as privilege escalation or data exfiltration, depending on the sensitivity of the retrieved information and the broader network architecture surrounding the affected system.
The operational impact of this vulnerability is severe due to its high confidentiality impact rating in the CVSS 3.1 scoring model, which assigns a base score of 7.5. Successful exploitation results in unauthorized access to critical data, potentially exposing sensitive business logic, customer information, or internal network topology details embedded within the WebCenter Sites database and configuration files. While integrity and availability impacts are currently listed as none, the compromise of confidentiality alone can lead to significant reputational damage, regulatory penalties under frameworks like GDPR or HIPAA if personal data is exposed, and loss of competitive advantage through intellectual property theft. Furthermore, attackers may use this initial access to map out additional vulnerabilities within the middleware stack, leveraging their newfound visibility into system configurations to craft more sophisticated attacks against other connected services.
Mitigation strategies must prioritize immediate patching where available, as Oracle typically releases security patches for such critical flaws in subsequent Critical Patch Updates. Organizations should ensure that all instances of WebCenter Sites running versions 12.2.1.4.0 and 14.1.2.0.0 are updated to the latest recommended version provided by Oracle. In scenarios where immediate patching is not feasible, network-level controls such as web application firewalls can be configured to block requests targeting known vulnerable endpoints or patterns associated with this exploit. Additionally, implementing strict access control policies and ensuring that administrative interfaces are only accessible from trusted IP ranges via VPN or bastion hosts can reduce the attack surface. Regular vulnerability scanning and penetration testing should also be conducted to identify similar misconfigurations across the middleware environment, ensuring comprehensive protection against both known and emerging threats targeting Oracle Fusion Middleware components.