CVE-2026-83031 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 low privileged attacker with network access via HTTP to compromise Oracle WebCenter Sites. While the vulnerability is in Oracle WebCenter Sites, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in takeover of Oracle WebCenter Sites. CVSS 3.1 Base Score 9.9 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
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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 represents a critical risk to organizations relying on this content management system for digital experience delivery. The core technical issue stems from an insufficient validation or access control mechanism within the HTTP handling logic of the WebCenter Sites application server. While the vulnerability is technically located in Oracle WebCenter Sites, its exploitation can lead to a scope change where additional products and underlying infrastructure are compromised due to shared resources, lateral movement capabilities, or integrated authentication mechanisms common in enterprise middleware environments. This interconnectedness means that compromising this single component can serve as an entry point for broader system takeover.
The operational impact of this vulnerability is severe, characterized by the potential for complete compromise of the affected Oracle WebCenter Sites instance. An attacker with low privileges and network access via HTTP can exploit this flaw to execute arbitrary code or escalate their permissions on the target system. The successful exploitation allows an unauthenticated or lightly authenticated remote actor to gain full control over the application environment. This level of access enables the attacker to modify, delete, or exfiltrate sensitive content stored within the CMS, manipulate website configurations, and potentially use the compromised server as a pivot point for further attacks against internal network assets. The high availability impact indicates that attackers can also disrupt service by crashing processes or consuming resources, leading to denial of service conditions alongside data breaches.
From a classification perspective, this vulnerability aligns with CWE-269 Improper Privilege Management and potentially CWE-78 OS Command Injection if the exploitation involves executing system commands through input vectors. The attack vector is classified as Network (AV:N) with Low Complexity (AC:L), indicating that no special conditions are required to exploit it beyond network connectivity. Crucially, the requirement for low privileges (PR:L) suggests that even users with minimal initial access can leverage this flaw to achieve high-impact results. The absence of user interaction (UI:N) makes automated exploitation straightforward and increases the likelihood of widespread compromise in unpatched environments. In terms of adversary tactics, this aligns with MITRE ATT&CK techniques related to Initial Access via web applications and Privilege Escalation within cloud or containerized infrastructure if applicable.
Mitigation strategies must prioritize immediate patching to the latest available version provided by Oracle that addresses this specific flaw. Organizations should also implement strict network segmentation to limit HTTP access to WebCenter Sites components, ensuring they are not directly exposed to untrusted networks without robust web application firewalls configured with rulesets capable of detecting and blocking exploitation attempts for similar vulnerability classes. Input validation hardening on any custom integrations or APIs associated with the platform is essential. Additionally, monitoring should be enhanced to detect anomalous HTTP requests that deviate from normal usage patterns, which may indicate active exploitation attempts. Regular audits of user privileges are recommended to ensure that low-privileged accounts do not possess unnecessary access rights that could facilitate this escalation path.