---
id: CVE-2026-91635
title: 'Vulnerability in Oracle Essbase (component: Security)'
summary: >-
  Vulnerability in Oracle Essbase (component: Security).   The supported version
  that is affected is 21.8.3.0.0. Difficult to exploit vulnerability allows
  unauthenticated attacker with network access via T3, IIOP to compromise Oracle
  Essba…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Oracle Corporation
product: Oracle Essbase
affected:
  - oracle_essbase 21.8.3.0.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-23T03:55:27.682893Z'
published: '2026-10-20'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T11:06:20.630Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-91635'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
    label: Oracle Advisory
tags:
  - cve.org
epss: 0.00336
epssPercentile: 0.26864
ingestedAt: '2026-10-20T22:23:33.711Z'
---

## Overview

Vulnerability in Oracle Essbase (component: Security).   The supported version that is affected is 21.8.3.0.0. Difficult to exploit vulnerability allows unauthenticated attacker with network access via T3, IIOP to compromise Oracle Essbase.  Successful attacks of this vulnerability can result in takeover of Oracle Essbase. CVSS 3.1 Base Score 8.1 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

## Affected

- `oracle_essbase 21.8.3.0.0`

## Remediation

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