CVE-2026-91661

Modified Modified - Updated After Analysis

Oracle Essbase Security Bypass Vulnerability

Publication date: 2026-10-20

Last updated on: 2026-10-27

Assigner: Oracle

Description

Vulnerability in Oracle Essbase (component: Security). 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-2026-91661

EUVD

EUVD-2026-106848

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	essbase	21.8.3.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Essbase version 21.8.3.0.0 within the Security component. 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

The vulnerability can result in unauthorized access to sensitive data stored in Oracle Essbase. Attackers may gain access to critical information, potentially leading to data breaches, loss of confidentiality, or further compromise of systems relying on Oracle Essbase.

Compliance Impact

This vulnerability allows unauthorized access to critical or all accessible data in Oracle Essbase, which could lead to exposure of sensitive personal or health information. Such breaches may violate GDPR (data protection) and HIPAA (health data privacy) requirements, potentially resulting in legal penalties and reputational damage.

Mitigation Strategies

Apply the latest Oracle Essbase security patches immediately. Restrict network access to Oracle Essbase via HTTP to trusted sources only. Review and update user privileges to ensure least privilege access. Monitor logs for unusual activity targeting Oracle Essbase.

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