---
id: "CVE-2026-91434"
kind: "vulnerability"
aliases: ["CVE-2026-91434"]
title: "Oracle Siebel CRM Deployment: local high-privilege user can take over server"
severity: "medium"
cvss: 6.7
epss: 0.00117
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["enterprise", "oracle", "siebel-crm", "vendor"]
not_affected_if: ["not-siebel-crm", "versions-outside-17.0-26.9"]
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-2026-91434", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91434", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM Deployment: local high-privilege user can take over server

Oracle Siebel CRM Deployment, in the Server Infrastructure component, has a flaw affecting supported versions 17.0 through 26.9. A user with high privileges and logon to the host where Siebel CRM Deployment runs can fully compromise the product.

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

## How to check

- Confirm whether Siebel CRM Deployment is installed and which version runs, as listed in Oracle's advisory.
- unknown: the sources do not give a file, command or setting to check further.

## Fix

- Apply the Oracle Critical Patch Update for Siebel CRM that covers the Server Infrastructure component; the target version is unknown from these sources.

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91434
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91434

## 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 takeover of Siebel CRM Deployment. CVSS 3.1 Base Score 6.7 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).

---

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