CVE-2026-91371 in Siebel CRM Cloud Applications
Summary
by MITRE • 10/21/2026
Vulnerability in the Siebel CRM Cloud Applications product of Oracle Siebel CRM (component: Siebel Cloud Manager). Supported versions that are affected are 22.3-26.9. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM Cloud Applications. While the vulnerability is in Siebel CRM Cloud Applications, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized read access to a subset of Siebel CRM Cloud Applications accessible data. CVSS 3.1 Base Score 5.8 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Siebel Cloud Manager component of Oracle Siebel CRM, specifically affecting supported versions ranging from 22.3 through 26.9. This security flaw represents a critical weakness in the application's access control mechanisms, allowing for unauthorized interaction with sensitive system resources. The core technical issue is characterized by an improper restriction of functionality or data exposure that permits unauthenticated actors to bypass standard authentication protocols. Because the vulnerability is exploitable via HTTP over the network and requires no user interface interaction or prior credentials, it presents a low barrier to entry for remote attackers seeking to compromise the integrity of the Siebel CRM Cloud Applications environment.
From an operational perspective, this flaw enables unauthorized read access to a specific subset of data within the Siebel CRM application. While the immediate impact is limited to confidentiality rather than integrity or availability, the scope change associated with this vulnerability significantly amplifies its risk profile. Although the technical root cause lies in the Cloud Manager component, successful exploitation can lead to broader compromises across additional products integrated with or dependent on the affected system. This lateral movement potential means that an attacker gaining access through this vector could potentially pivot to other critical systems within the enterprise infrastructure, thereby escalating a localized information disclosure into a widespread security incident affecting multiple organizational assets.
The severity of this vulnerability is quantified by a CVSS 3.1 Base Score of 5.8, which classifies it as medium risk primarily due to its impact on confidentiality. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N) indicates that the attack is network-based with low complexity and requires no privileges or user interaction, yet it exhibits a changed scope where the vulnerability in one component impacts other components. In terms of industry standard classifications, this behavior aligns closely with CWE-284 Improper Access Control and CWE-798 Use of Hard-coded Credentials if authentication bypass is involved through static values, though primarily it reflects CWE-601 URL Redirection to Untrusted Site or similar access control failures depending on the specific mechanism. Furthermore, within the MITRE ATT&CK framework, this vulnerability facilitates initial access techniques such as Exploit Public-Facing Application (T1190) and potentially Credential Access if session tokens are intercepted due to insufficient protections against unauthenticated requests.
To mitigate this risk, organizations must prioritize immediate patching of all affected Siebel CRM versions to the latest supported release provided by Oracle. In scenarios where patching is not immediately feasible, network-level controls should be implemented to restrict access to the Siebel Cloud Manager interface exclusively from trusted internal IP ranges or through a secure bastion host with strict authentication requirements. Web Application Firewalls can also be configured to detect and block anomalous HTTP requests that attempt to exploit this unauthenticated access vector. Continuous monitoring of system logs for unauthorized read attempts is essential, as early detection can limit the extent of data exfiltration before full exploitation occurs. Regular security assessments and penetration testing should include specific checks for improper access controls in cloud management interfaces to ensure such vulnerabilities do not persist in production environments.