CVE-2026-91636

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).

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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-2026-91636

EUVD

EUVD-2026-106823

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 data accessible by Oracle Essbase.

Detection Guidance

Detection requires checking for Oracle Essbase versions and monitoring network traffic for unauthorized access attempts. Verify installed versions with commands like 'opatch lsinventory' or check Oracle Essbase logs for suspicious HTTP requests. Ensure firewall rules restrict HTTP access to only trusted sources.

Impact Analysis

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

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 Essbase version 21.8.3.0.0. Restrict network access to Oracle Essbase via HTTP to trusted sources only. Review and enforce strict access controls for low-privileged users. Monitor logs for unusual activity targeting Oracle Essbase.

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