---
id: "CVE-2026-91438"
kind: "vulnerability"
aliases: ["CVE-2026-91438"]
title: "Oracle Siebel CRM Deployment: low-privilege HTTP flaw exposes and alters CRM data"
severity: "high"
cvss: 7.1
epss: 0.00278
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["crm", "oracle", "self-hosted", "siebel-crm", "vendor"]
not_affected_if: ["unknown"]
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-2026-91438", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91438", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Siebel CRM Deployment: low-privilege HTTP flaw exposes and alters CRM data

Oracle Siebel CRM Deployment, Server Infrastructure component, versions 17.0 through 26.9, has a flaw reachable over HTTP. An attacker with a low-privilege account can read critical data and modify or delete some CRM records.

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

## How to check

- Identify the Siebel CRM Deployment version in use and compare it against the affected range 17.0-26.9
- unknown for other checks; the sources do not say which configuration or file to inspect

## Fix

- Apply the Oracle Siebel CRM security patch for the Server Infrastructure component; the sources do not name the fixed version
- unknown for other actions

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91438
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91438

## 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 network access via HTTP 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 as well as  unauthorized update, insert or delete access to some of Siebel CRM Deployment accessible data. CVSS 3.1 Base Score 7.1 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N).

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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_