CVE-2026-83217 in Siebel CRM End User
Summary
by MITRE • 09/16/2026
Vulnerability in the Siebel CRM End User product of Oracle Siebel CRM (component: Open UI). Supported versions that are affected are 17.0-26.7. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Siebel CRM End User. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Siebel CRM End User accessible data as well as unauthorized update, insert or delete access to some of Siebel CRM End User accessible data. CVSS 3.1 Base Score 7.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N).
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Open UI component of Oracle Siebel CRM, specifically affecting end-user versions ranging from 17.0 through 26.7. This security flaw represents a significant risk to organizations relying on this enterprise customer relationship management platform for critical business operations and data storage. The core issue stems from insufficient access control mechanisms or improper validation within the Open UI layer, which serves as the primary interface between end-users and the underlying Siebel CRM backend services. Because the vulnerability is easily exploitable by low-privileged attackers who possess network access via HTTP, it indicates a fundamental weakness in how authentication states are maintained or validated during client-server interactions. This allows an adversary to bypass intended security boundaries without requiring complex exploitation techniques or high-level privileges, thereby lowering the barrier for entry significantly compared to more sophisticated attack vectors that might require privilege escalation or physical proximity.
From a technical perspective, this vulnerability aligns with CWE-284 Improper Access Control and potentially CWE-79 Cross-site Scripting if the unauthorized access involves injecting malicious scripts into web pages viewed by other users, although the primary description emphasizes data compromise rather than script execution. The attacker leverages network connectivity to send crafted HTTP requests that exploit the flaw in the Open UI processing logic. By manipulating these requests, the adversary can trick the system into treating unauthenticated or low-privileged actions as legitimate operations performed by authorized high-level users. This bypass of access controls enables the retrieval of sensitive information stored within the CRM database and allows for the modification or deletion of records that should be protected from such interference. The simplicity of the attack vector, requiring only network access and basic HTTP knowledge, makes it particularly dangerous in environments where internal networks are not strictly segmented or where default credentials might still be in use.
The operational impact of this vulnerability is severe due to its direct effect on both confidentiality and integrity, as reflected by a CVSS 3.1 Base Score of 7.1. The high confidence level for data exposure means that attackers can extract critical business intelligence, customer personal identifiable information, financial records, or strategic plans stored within the Siebel CRM system. This breach of confidentiality can lead to regulatory penalties under frameworks such as GDPR or HIPAA if protected health information or sensitive consumer data is exposed. Furthermore, the ability to perform unauthorized updates, inserts, and deletes poses a direct threat to business integrity. An attacker could alter customer contact details, modify sales forecasts, delete transaction records, or inject fraudulent entries into the system. Such actions can disrupt normal business operations, lead to financial loss through erroneous transactions, and damage organizational reputation when data tampering is discovered by clients or partners.
In terms of attack classification within industry standards like MITRE ATT&CK, this vulnerability facilitates techniques associated with Initial Access and Credential Access if it leads to further compromise, but more directly maps to Defense Evasion via privilege abuse and Impact categories such as Data Exfiltration and Data Manipulation. The lack of user interaction required for exploitation means that automated scanning tools can rapidly identify vulnerable instances across a network, increasing the likelihood of widespread compromise in unpatched environments. Organizations must recognize that even low-privileged accounts within an internal network pose a substantial threat when combined with such accessible vulnerabilities, as lateral movement becomes easier once initial foothold is gained through this entry point.
To mitigate these risks, immediate action should be taken to apply all available security patches and updates provided by Oracle for the affected Siebel CRM versions. Since the vulnerability affects specific version ranges from 17.0 to 26.7, administrators must verify their current deployment status against Oracle’s official support matrix to ensure they are running a patched release that addresses this Open UI flaw. In addition to patching, implementing strict network segmentation is crucial; restricting HTTP access to Siebel CRM endpoints only to authorized IP ranges and enforcing multi-factor authentication for all user accounts can significantly reduce the attack surface. Web Application Firewalls should be configured with rules specifically designed to detect anomalous HTTP requests that attempt to manipulate session tokens or bypass standard validation checks associated with this vulnerability type. Regular security audits and penetration testing focused on access control mechanisms will help identify similar weaknesses before they are exploited by malicious actors, ensuring a more resilient posture for critical enterprise applications.