CVE-2026-91654

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. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Essbase accessible data as well as unauthorized read access to a subset of Oracle Essbase accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Essbase. CVSS 3.1 Base Score 6.3 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).

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-2026-91654

EUVD

EUVD-2026-106841

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 vulnerability affects Oracle Essbase version 21.8.3.0.0 in its Security component. It allows a low-privileged attacker with network access via HTTP to compromise the system. Successful exploitation can lead to unauthorized data access, modification, or deletion, as well as partial denial of service.

Detection Guidance

Detection requires monitoring Oracle Essbase logs for unusual HTTP access patterns or unauthorized data modifications. Check for excessive failed login attempts or unexpected administrative actions. Use network traffic analysis tools like Wireshark to inspect HTTP requests targeting Essbase ports.

Impact Analysis

An attacker could read, modify, or delete some Oracle Essbase data, or disrupt service availability. This could lead to data breaches, integrity issues, or service outages affecting business operations.

Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA due to unauthorized read access to data and potential data modification or deletion. Unauthorized access to sensitive data may violate GDPR's data protection principles and HIPAA's confidentiality requirements, leading to legal and regulatory penalties.

Mitigation Strategies

Apply the latest security patches from Oracle for Oracle Essbase version 21.8.3.0.0. Restrict network access to the HTTP interface and limit privileges for users to the minimum required. Monitor for unusual activity and unauthorized data access attempts.

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EPSS Chart

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