CVE-2026-70859 in Siebel CRM Integration
Summary
by MITRE • 08/19/2026
Vulnerability in the Siebel CRM Integration product of Oracle Siebel CRM (component: REST). Supported versions that are affected are 17.0-26.6. Difficult to exploit vulnerability allows low privileged attacker with network access via HTTP to compromise Siebel CRM Integration. While the vulnerability is in Siebel CRM Integration, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in takeover of Siebel CRM Integration. CVSS 3.1 Base Score 8.5 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 08/19/2026
The identified vulnerability resides within the REST component of Oracle Siebel CRM Integration, specifically affecting supported versions ranging from 17.0 through 26.6. This security flaw represents a critical risk to enterprise environments relying on this customer relationship management platform for business operations and data integration. The core technical issue involves an authentication bypass or improper access control mechanism within the REST API interface, which allows unauthorized entities to interact with sensitive system functions that should be restricted to authenticated users. Although the vulnerability is classified as difficult to exploit due to high complexity requirements in its attack vector, it remains a significant threat because it does not require user interaction and can be triggered remotely over HTTP networks. This characteristic makes it particularly dangerous for organizations where internal network segmentation may be insufficient or where legacy systems expose these interfaces directly to broader network segments.
From an operational perspective, the impact of this vulnerability is severe due to its scope change behavior. While the initial point of compromise is limited to the Siebel CRM Integration module, successful exploitation can lead to a lateral movement scenario that significantly impacts additional products within the Oracle ecosystem or connected enterprise systems. This cascading effect means that compromising the integration layer does not just result in data exposure but potentially grants an attacker control over adjacent services and databases linked through this integration point. The ability of a low-privileged attacker with network access via HTTP to achieve full system takeover indicates a fundamental failure in privilege separation and input validation within the REST API handlers. This aligns closely with CWE-287, which describes Improper Authentication, and CWE-915, which refers to Improper Control of Dynamically-Identified Variables, suggesting that the application fails to adequately verify user privileges before executing administrative or sensitive operations through its web services interface.
The severity of this vulnerability is quantified by a CVSS 3.1 Base Score of 8.5, indicating a High level of risk. The vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H) reveals that while the attack complexity is high and requires low privileges, the scope changes from user to system upon successful exploitation. This results in high impacts on confidentiality, integrity, and availability. In practical terms, an attacker could exfiltrate sensitive customer data, modify critical business records, or disrupt service availability by manipulating integration workflows. The presence of a scope change is particularly alarming as it expands the blast radius beyond the immediate application to include dependent systems that trust the Siebel CRM Integration layer for data consistency and workflow automation. This behavior mirrors tactics observed in ATT&CK technique T1078, Valid Accounts, where attackers leverage legitimate credentials or bypass authentication mechanisms to gain initial access, followed by T1534, Internal Spearphishing, if lateral movement is used to reach other systems within the network perimeter.
Mitigation strategies must prioritize immediate patching of all affected Siebel CRM Integration instances to version 26.7 or later where available, as this typically includes the necessary code fixes for REST API validation and authentication checks. In environments where patching is not immediately feasible, organizations should implement strict network segmentation rules that restrict HTTP access to the integration endpoints solely from trusted application servers and internal management networks. Additionally, deploying a Web Application Firewall with specific rule sets designed to detect anomalous REST API calls can provide an additional layer of defense by blocking requests that exhibit patterns consistent with exploitation attempts for this vulnerability. It is also crucial to enforce multi-factor authentication for all administrative accounts associated with the Siebel CRM platform and to audit logs regularly for any signs of unauthorized access or privilege escalation events, ensuring rapid detection and response in case a bypass attempt occurs despite preventive controls.