---
id: "CVE-2026-91439"
kind: "vulnerability"
aliases: ["CVE-2026-91439"]
title: "Oracle Siebel CRM Deployment: low-privileged local user reads critical data"
severity: "medium"
cvss: 5.5
epss: 0.00133
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["on-prem", "oracle", "siebel-crm", "vendor"]
not_affected_if: ["version-outside-17.0-26.9"]
published_at: "2026-10-20T22:20:47+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-2026-91439", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91439", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM Deployment: low-privileged local user reads critical data

Oracle Siebel CRM Deployment, Server Infrastructure component, has a flaw that lets an attacker with logon to the host where it runs compromise the deployment. A successful attack gives unauthorized access to critical data held by Siebel CRM Deployment.

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

## How to check

- Confirm the Siebel CRM Deployment version in use; the sources say versions 17.0 through 26.9 are affected
- unknown for other checks, the sources do not say how to inspect the deployment

## Fix

- Apply the Oracle Siebel CRM Critical Patch Update for the affected release; the sources do not name the fixed version
- unknown for other actions, the sources do not say

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91439
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91439

## 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 low 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 access to critical data or complete access to all Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 5.5 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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_