CVE-2026-91436

Analyzed Analyzed - Analysis Complete

Siebel CRM Deployment Privilege Escalation Vulnerability

Publication date: 2026-10-20

Last updated on: 2026-11-04

Assigner: Oracle

Description

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 high privileged attacker with logon to the infrastructure where Siebel CRM Deployment executes to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Siebel CRM Deployment accessible data as well as unauthorized read access to a subset of Siebel CRM Deployment accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Siebel CRM Deployment. CVSS 3.1 Base Score 3.9 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-11-04

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-91436

EUVD

EUVD-2026-106686

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	siebel_crm	From 17.0 (inc) to 26.9 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Siebel CRM Deployment versions 17.0-26.9. It allows a highly privileged attacker with local system access to exploit weaknesses in the server infrastructure. The attack requires logon to the system where Siebel CRM Deployment runs. Exploitation could lead to unauthorized data access or modification, partial denial of service, or data disclosure.

Detection Guidance

Detection requires checking for Oracle Siebel CRM Deployment versions 17.0-26.9. Verify installed versions using Oracle's tools or system package managers. Monitor logs for unauthorized access attempts or unusual data modifications in the Siebel CRM Deployment infrastructure.

Impact Analysis

If you use Oracle Siebel CRM Deployment versions 17.0-26.9, an attacker with high privileges and local access could read, modify, or delete some data, or disrupt services partially. This could lead to data breaches, integrity issues, or service outages affecting business operations.

Compliance Impact

This vulnerability could impact compliance by allowing unauthorized access to sensitive data, which may violate GDPR (data protection) or HIPAA (health data privacy). Unauthorized data modification or deletion could also breach integrity requirements. Organizations must assess exposure and apply patches to maintain compliance.

Mitigation Strategies

Apply the latest Oracle Critical Patch Update (CPU) for Siebel CRM Deployment versions 17.0-26.9 to address the vulnerability. Ensure only trusted users with minimal required privileges have logon access to the infrastructure where Siebel CRM Deployment executes.

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EPSS Chart

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