---
id: CVE-2026-91421
title: >-
  Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM
  (component: Server Infrastructure)
summary: >-
  Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM
  (component: Server Infrastructure).  Supported versions that are affected are
  17.0-26.9. Difficult to exploit vulnerability allows unauthenticated attacker
  with netw…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
vendor: Oracle Corporation
product: Siebel CRM Deployment
affected:
  - siebel_crm_deployment >= 17.0 <= 26.9
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T21:25:52.749Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-91421'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
    label: Oracle Advisory
tags:
  - cve.org
ingestedAt: '2026-10-20T22:23:33.760Z'
---

## Overview

Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure).  Supported versions that are affected are 17.0-26.9. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM Deployment.  Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Siebel CRM Deployment. CVSS 3.1 Base Score 5.9 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

## Affected

- `siebel_crm_deployment >= 17.0 <= 26.9`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.