CVE-2026-91443 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. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 6.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 Deployment, specifically affecting supported versions ranging from 17.0 through 26.9. 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 nature of the defect allows an attacker with low privileges who possesses network access via HTTP to compromise the integrity and confidentiality of the deployment environment. Unlike vulnerabilities that require high-level administrative rights or complex user interaction, this flaw can be exploited by individuals with minimal initial access levels, thereby lowering the barrier for entry significantly within internal networks where such credentials might already exist due to poor identity management practices.
From a technical perspective, the vulnerability enables unauthorized access to critical data stored within the Siebel CRM Deployment system. The exploitation vector is network-based and operates over HTTP, which suggests that the flaw may involve improper validation of input parameters or insufficient authorization checks when processing requests directed at specific server infrastructure endpoints. Because the attack does not require user interaction, it can be automated and executed remotely by an attacker who has established a foothold within the local network segment or through compromised credentials with basic access rights. The successful exploitation leads to high confidentiality impacts, meaning that sensitive customer information, proprietary business data, and internal operational details could be exfiltrated without detection if proper monitoring is not in place.
The impact of this vulnerability extends beyond simple data theft. While the CVSS 3.1 base score of 6.5 indicates a medium severity primarily driven by confidentiality loss rather than integrity or availability impacts, the consequences for an organization can be severe. Unauthorized access to all Siebel CRM Deployment accessible data exposes the enterprise to regulatory compliance violations under frameworks such as GDPR, HIPAA, or PCI-DSS, depending on the nature of the stored data. Furthermore, this exposure facilitates further lateral movement within the network, as attackers often use harvested credentials and internal data maps to target more critical systems. The lack of required user interaction makes this particularly dangerous in environments where employees may inadvertently trigger malicious requests through phishing campaigns that direct browsers to attacker-controlled servers mimicking legitimate Siebel endpoints.
In terms of industry standard classifications, this vulnerability aligns with CWE-284 Improper Access Control and potentially CWE-798 if it involves hardcoded credentials or excessive privileges within the service account context. From an offensive security perspective, such exploitation techniques are consistent with MITRE ATT&CK tactics related to Initial Access via Valid Accounts and Collection through Client Side Discovery. The network-based nature of the attack places it firmly in the Remote Code Execution or Data Exfiltration categories depending on how the unauthorized access is leveraged post-exploitation. Organizations must recognize that low-privileged accounts are often overlooked in security assessments, yet they provide a viable entry point for attackers aiming to escalate privileges or harvest sensitive information from centralized databases like Siebel CRM.
To mitigate this risk, immediate action should focus on applying the latest security patches provided by Oracle for all affected versions of Siebel CRM Deployment between 17.0 and 26.9. It is critical to verify that the patching process includes updates to the underlying server infrastructure components responsible for handling HTTP requests. In addition to patching, organizations should implement strict network segmentation strategies to limit access to the Siebel deployment servers from untrusted or public-facing networks. Access control lists should be reviewed to ensure that only authorized IP ranges can communicate with these critical services over HTTP. Furthermore, deploying Web Application Firewalls configured to detect and block anomalous request patterns associated with this specific vulnerability can provide an additional layer of defense while patching efforts are underway.
Long-term remediation strategies must include a comprehensive review of identity and access management policies within the Siebel environment. This involves enforcing multi-factor authentication for all administrative and privileged accounts, even those used by service processes where feasible, to prevent credential-based attacks from succeeding. Regular vulnerability scanning should be conducted specifically targeting HTTP endpoints on internal networks to identify similar misconfigurations or unpatched services before they can be exploited. Security awareness training should also be enhanced to educate employees about the risks of interacting with suspicious links that could trigger automated exploitation attempts against low-privileged accounts, thereby reducing the likelihood of initial compromise through social engineering vectors.