CVE-2026-83201 in Siebel CRM Deployment
Summary
by MITRE • 09/16/2026
Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). Supported versions that are affected are 17.0-26.7. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Siebel CRM Deployment accessible data as well as unauthorized access to critical data or complete access to all Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 9.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Server Infrastructure component of Oracle Siebel CRM Deployment, specifically affecting supported versions ranging from 17.0 through 26.7. This security flaw represents a critical deficiency in the authentication and access control mechanisms governing HTTP-based interactions with the deployment service. The nature of this weakness allows an unauthenticated attacker who possesses network connectivity to the target system to exploit the vulnerability remotely without requiring any user interaction or prior credentials. Such conditions classify the attack vector as Network accessible with Low complexity, indicating that automated exploitation tools can readily leverage this flaw against vulnerable instances.
From a technical perspective, the core issue stems from insufficient validation of incoming HTTP requests directed at specific endpoints within the Siebel CRM Deployment architecture. The system fails to properly enforce authentication requirements for certain administrative or data-manipulation operations, effectively bypassing standard security controls. This lack of proper authorization checks permits malicious actors to execute commands that alter the state of critical application data. The vulnerability aligns with CWE-287, which describes Improper Authentication, and potentially CWE-862, Missing Authorization, as it allows actions that should be restricted to privileged users to be performed by anonymous entities.
The operational impact of this vulnerability is severe, characterized by high impacts on both confidentiality and integrity while availability remains largely unaffected according to the provided CVSS metrics. Successful exploitation enables an attacker to create, delete, or modify critical data within the Siebel CRM environment. This capability extends beyond isolated records to potentially encompass all accessible data managed by the deployment service. Consequently, sensitive customer information, configuration settings, and business-critical datasets are exposed to unauthorized modification or exfiltration. In terms of threat modeling, this behavior corresponds to ATT&CK techniques such as T1078 Valid Accounts if credentials were somehow obtained for lateral movement, but primarily reflects T1496 Remote File Copy or data manipulation tactics where the attacker establishes persistence or alters system state without detection by standard monitoring tools due to the lack of authentication logs.
The CVSS 3.1 base score of 9.1 underscores the critical severity of this issue, driven by the high confidentiality and integrity impacts combined with an attack vector that requires no user interaction and low complexity. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N) explicitly highlights that while system availability is not directly compromised in this specific exploit scenario, the potential for data breach and tampering poses a significant risk to organizational integrity and compliance posture. Organizations relying on Siebel CRM Deployment must recognize that unauthenticated access via HTTP can lead to complete compromise of accessible data stores if left unpatched.
Mitigation strategies should prioritize immediate application of vendor-provided security patches or updates released by Oracle for the affected version range. In environments where patching is not immediately feasible, network-level controls such as Web Application Firewalls (WAF) should be configured to block unauthorized HTTP requests targeting vulnerable endpoints. Additionally, restricting access to Siebel CRM Deployment services to trusted IP ranges via firewall rules can significantly reduce the attack surface by preventing unauthenticated attackers from reaching the service over the public internet. Regular security audits and penetration testing focused on authentication bypasses are recommended to ensure that such vulnerabilities do not persist in production environments.