CVE-2026-83043 in WebCenter Portal
Summary
by MITRE • 09/16/2026
Vulnerability in the Oracle WebCenter Portal product of Oracle Fusion Middleware (component: Composer). 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 Portal. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle WebCenter Portal, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in takeover of Oracle WebCenter Portal. CVSS 3.1 Base Score 9.6 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 Composer component of Oracle WebCenter Portal, a key element of the Oracle Fusion Middleware suite affecting versions 12.2.1.4.0 and 14.1.2.0.0. This security flaw is classified as an easily exploitable issue that permits unauthenticated attackers to compromise the target system through network access via HTTP. The severity of this vulnerability is underscored by a CVSS 3.1 Base Score of 9.6, indicating critical risk levels across confidentiality, integrity, and availability dimensions. The specific vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H) highlights that while the attack requires human interaction from a victim other than the attacker, it demands no prior authentication and has low complexity to execute. Furthermore, the scope change parameter indicates that although the vulnerability is localized within Oracle WebCenter Portal, successful exploitation can lead to significant impacts on additional products or services connected to the compromised environment, thereby expanding the blast radius of the attack beyond the immediate application boundary.
From a technical perspective, this vulnerability aligns with CWE-79, which describes Cross-Site Scripting (XSS) flaws where untrusted data is not properly validated before being included in web pages served to other users. In the context of Oracle WebCenter Portal's Composer component, an attacker can likely inject malicious scripts or commands that are executed by a victim user’s browser when interacting with specific portal features. The requirement for human interaction suggests that the attack vector relies on social engineering tactics, such as phishing emails or deceptive links, to trick users into triggering the exploit. Once triggered, the injected code runs in the context of the authenticated session of the victim, allowing the attacker to bypass standard access controls and perform actions with the privileges of that user. This mechanism enables the takeover of Oracle WebCenter Portal by hijacking active sessions, stealing sensitive cookies or tokens, or manipulating page content to facilitate further malicious activities.
The operational impact of this vulnerability is severe due to its high availability score in the CVSS metrics. An attacker who successfully exploits this flaw can achieve complete control over the affected instance, leading to unauthorized access to confidential data stored within the portal, modification of critical configurations or content (integrity compromise), and potentially causing denial of service by disrupting normal operations. The scope change aspect amplifies these risks; if Oracle WebCenter Portal is integrated with other enterprise systems such as databases, identity management solutions, or downstream applications, a compromised portal can serve as a pivot point for lateral movement within the network. This could lead to broader systemic failures, data breaches across multiple departments, and significant reputational damage due to the loss of trust in the organization’s digital infrastructure.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. The primary recommendation is to apply the latest available patches or updates provided by Oracle for versions 12.2.1.4.0 and 14.1.2.0.0, which should contain fixes for this specific Composer component flaw. In environments where patching cannot be immediately implemented due to operational constraints, network-level controls such as Web Application Firewalls (WAF) can be configured to detect and block common XSS payloads or suspicious HTTP requests targeting the affected endpoints. Additionally, implementing strict Content Security Policy headers can help mitigate the impact of any successfully injected scripts by restricting the sources from which content can be loaded. User awareness training is also critical given the UI:R requirement; educating staff on recognizing phishing attempts and avoiding interaction with untrusted links reduces the likelihood of successful exploitation. Regular security assessments and penetration testing should be conducted to identify similar weaknesses in other components of the Fusion Middleware suite, ensuring a comprehensive defense against evolving threats aligned with ATT&CK techniques related to client-side code injection and session hijacking.