CVE-2026-91659

Modified Modified - Updated After Analysis

Oracle Essbase Unauthorized Data Access Vulnerability

Publication date: 2026-10-20

Last updated on: 2026-10-27

Assigner: Oracle

Description

Vulnerability in Oracle Essbase (component: Build). The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Essbase. While the vulnerability is in Oracle Essbase, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Essbase accessible data. CVSS 3.1 Base Score 7.7 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-10-27

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-91659

EUVD

EUVD-2026-106846

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	essbase	21.8.3.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Essbase version 21.8.3.0.0. It allows a low-privileged attacker with network access via HTTP to compromise the system. Successful exploitation can lead to unauthorized access to critical data or complete access to all Oracle Essbase accessible data.

Impact Analysis

An attacker could gain unauthorized access to sensitive data stored in Oracle Essbase. This may include confidential business information or personal data, depending on what the system holds.

Compliance Impact

This vulnerability allows unauthorized access to critical or all Oracle Essbase accessible data, which could lead to exposure of sensitive personal or health information. Such data breaches may violate GDPR (General Data Protection Regulation) due to unauthorized processing or disclosure of personal data, and HIPAA (Health Insurance Portability and Accountability Act) if protected health information is compromised.

Mitigation Strategies

Apply the latest security patches from Oracle for Oracle Essbase version 21.8.3.0.0. Restrict network access to HTTP ports used by Oracle Essbase. Monitor for unauthorized access attempts to critical data.

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