CVE-2026-91422 in Siebel CRM Deployment
Summary
by MITRE • 10/21/2026
Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). Supported versions that are affected are 17.0-26.9. Difficult to exploit vulnerability allows low privileged 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. CVSS 3.1 Base Score 5.3 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Server Infrastructure component of Oracle Siebel CRM, specifically affecting deployment configurations across versions ranging from 17.0 to 26.9. This security flaw is characterized by a complex exploitation vector that requires an attacker with low privileges and network access via HTTP to successfully compromise the system. The difficulty associated with exploiting this vulnerability suggests that while it presents a tangible risk, it does not lend itself to trivial automated attacks or widespread remote code execution without significant effort from the adversary. The presence of high complexity in the attack chain serves as a partial mitigating factor against broad-scale exploitation attempts, yet it remains sufficient for targeted attackers who possess local network access and basic authentication credentials within the Siebel environment.
From an operational perspective, the successful exploitation of this vulnerability leads to severe integrity violations rather than confidentiality breaches or availability disruptions. An attacker can achieve unauthorized creation, deletion, or modification of critical data stored within the Siebel CRM Deployment system. This capability directly impacts the trustworthiness and accuracy of business-critical information managed by the organization. Since Siebel CRM is often used for managing customer relationships, sales pipelines, and operational workflows, any alteration to this data can lead to significant financial loss, reputational damage, or regulatory non-compliance. The absence of impact on confidentiality means that sensitive personal data may not be directly exfiltrated through this specific flaw, but the ability to corrupt or erase records poses a substantial threat to business continuity and decision-making processes based on accurate CRM data.
In terms of industry standard classifications, this vulnerability aligns with CWE-269 Improper Privilege Management due to its reliance on low-privileged access for exploitation, although it also exhibits characteristics of CWE-78 Improper Neutralization of Special Elements used in an OS Command or CWE-91 SQL Injection depending on the specific underlying mechanism causing the data modification. The attack vector corresponds to ATT&CK technique T1053 Scheduled Task/Job which may be involved if persistence is established, but more accurately maps to T1222 File and Directory Permissions Modification for altering system configurations or T1489 Service Stop for potential denial of service implications through deletion. However, the primary classification remains centered on integrity violations where an actor manipulates data states without proper authorization checks being enforced by the application logic during deployment operations.
Mitigation strategies should prioritize immediate patching to the latest supported version of Oracle Siebel CRM that addresses this specific Server Infrastructure flaw. Organizations must ensure that their update management processes are agile enough to deploy security patches promptly, given the network-accessible nature of the vulnerability. Additionally, implementing strict access controls and principle of least privilege is essential; even though low-privileged accounts can exploit this issue, restricting such accounts from accessing deployment-related endpoints or administrative functions can reduce the attack surface. Network segmentation should be employed to limit HTTP access to critical CRM infrastructure components, ensuring that only authorized management networks can interact with these services. Regular auditing of data integrity and monitoring for anomalous creation or deletion events within the Siebel database will aid in early detection of exploitation attempts. Finally, reviewing authentication mechanisms to ensure strong credential policies can further hinder attackers who rely on low-privileged access vectors to initiate their exploits.