CVE-2026-73959 in WebCenter Portal
Summary
by MITRE • 09/15/2026
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 low privileged attacker with network access via HTTP to compromise Oracle WebCenter Portal. Successful attacks of this vulnerability can result in takeover of Oracle WebCenter Portal. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 09/15/2026
The identified vulnerability resides within the Composer component of Oracle WebCenter Portal, a key element of the Oracle Fusion Middleware suite used for building and managing enterprise web applications. This security flaw affects specific supported versions, namely 12.2.1.4.0 and 14.1.2.0.0, indicating that even recently maintained releases are susceptible to exploitation. The nature of this vulnerability is particularly concerning because it allows an attacker with low privileges and network access via HTTP to compromise the system. This means that authentication or high-level credentials are not required for initial access, significantly lowering the barrier to entry for malicious actors who can interact with the application over standard web protocols.
From a technical perspective, the flaw enables unauthorized actions that lead to a complete takeover of the Oracle WebCenter Portal environment. The ability to escalate privileges from low-privileged user accounts to full administrative control suggests a critical failure in access control mechanisms or input validation within the Composer module. Such vulnerabilities often stem from improper enforcement of security policies where the application fails to verify if an authenticated user has sufficient rights to perform specific operations, such as modifying system configurations, deploying malicious content, or executing arbitrary code. The use of HTTP rather than HTTPS further exacerbates the risk by allowing potential interception and manipulation of traffic in transit, although the core issue lies in the server-side logic that accepts these requests without adequate verification.
The operational impact of this vulnerability is severe, as reflected by its CVSS 3.1 Base Score of 8.8, which classifies it as High severity. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) details the specific dimensions of this risk. Attack Vector Network indicates remote exploitation is possible without physical access. Low Attack Complexity means that specialized conditions or user interaction are not required to exploit the flaw. The requirement for Low Privileges confirms that standard, non-administrative accounts can trigger the vulnerability. No User Interaction implies the attack can be automated and executed silently against targeted systems. Most critically, the High impact on Confidentiality, Integrity, and Availability signifies a total compromise scenario. An attacker could exfiltrate sensitive data, alter application behavior or content to serve malicious purposes, and disrupt service availability by crashing processes or locking out legitimate users.
In terms of industry standard classifications, this vulnerability aligns with CWE-269 Improper Privilege Management, where the software does not properly assign privileges to actors based on their authorization levels. It also relates closely to CWE-862 Missing Authorization, as the system fails to enforce proper access controls for critical functions within the Composer component. From a tactical standpoint in the MITRE ATT&CK framework, this vulnerability facilitates Initial Access through valid accounts and potentially Privilege Escalation if the low-privileged account serves as a foothold for further lateral movement or control escalation. The ability to take over the portal allows an attacker to establish persistence within the enterprise network, using the compromised middleware instance as a pivot point for additional attacks against backend databases or other integrated systems.
Mitigation strategies must prioritize immediate remediation due to the high severity and ease of exploitation. Organizations running affected versions should apply the latest security patches provided by Oracle immediately after verifying compatibility with their existing deployments. If patching is not feasible in the short term, network-level controls such as Web Application Firewalls can be configured to block requests that exhibit patterns associated with this specific vulnerability, although signature-based detection may lag behind zero-day exploits. Access control lists should be reviewed to ensure that Composer-related endpoints are restricted to only those users who absolutely require administrative privileges. Additionally, enforcing HTTPS for all communications eliminates the risk of traffic interception and ensures integrity during transmission, reducing the attack surface even if the underlying code flaw remains unpatched temporarily until a full remediation cycle can occur.