---
id: "CVE-2026-91427"
kind: "vulnerability"
aliases: ["CVE-2026-91427"]
title: "Oracle Siebel CRM Deployment: high-privilege user can partially disrupt service"
severity: "low"
cvss: 2.3
epss: 0.00148
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["oracle", "self-hosted", "siebel-crm", "vendor"]
not_affected_if: ["no-siebel-deployment"]
published_at: "2026-10-20T22:20:46+00:00"
first_seen_at: "2026-10-23T21:57:26+00:00"
updated_at: "2026-10-25T12:38:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91427", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91427", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM Deployment: high-privilege user can partially disrupt service

Oracle Siebel CRM Deployment, in the Server Infrastructure component, has a flaw that lets a highly privileged local user partially disrupt the service. The sources describe only a partial denial of service with no confidentiality or integrity impact.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether the Siebel CRM Deployment product is installed and which version it runs: unknown
- Confirm whether the installed version falls in 17.0 to 26.9: unknown

## Fix

- Apply the Oracle Siebel CRM patch referenced in the Oracle Critical Patch Update for the affected release: unknown

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91427
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91427

## From the sources

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 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 ability to cause a partial denial of service (partial DOS) of Siebel CRM Deployment. CVSS 3.1 Base Score 2.3 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_