---
id: "CVE-2026-91423"
kind: "vulnerability"
aliases: ["CVE-2026-91423"]
title: "Oracle Siebel CRM Deployment: local high-privilege flaw exposes CRM data"
severity: "medium"
cvss: 6.0
epss: 0.00158
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["on-premises", "oracle", "self-hosted", "siebel-crm", "vendor"]
not_affected_if: ["managed-hosting", "outside-affected-versions"]
published_at: "2026-10-20T22:20:45+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-2026-91423", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91423", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM Deployment: local high-privilege flaw exposes CRM data

Oracle Siebel CRM Deployment, in the Server Infrastructure component, has a flaw affecting supported versions 17.0 through 26.9. An attacker who already holds high privileges and logon on the host where Siebel CRM Deployment runs can create, change, delete or read critical CRM data.

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

## How to check

- Check the installed Siebel CRM Deployment version against the affected range 17.0-26.9 in the Oracle Siebel documentation
- unknown

## Fix

- Apply the Oracle Critical Patch Update fix for Siebel CRM Deployment; the fixed version is unknown from the sources

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91423
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91423

## 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 creation, deletion or modification access to critical data or all Siebel CRM Deployment accessible data as well as  unauthorized access to critical data or complete access to all Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 6.0 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N).

---

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