CVE-2026-91646

Modified Modified - Updated After Analysis

Unauthenticated Data Access in Oracle Essbase

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. 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 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 5.6 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/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-2026-91646

EUVD

EUVD-2026-106833

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 affecting the Security component. It allows an unauthenticated attacker with network access via T3 or IIOP protocols to compromise the system. Successful exploitation can lead to unauthorized data access or modification and partial denial of service.

Detection Guidance

Detection requires monitoring network traffic for unauthorized access attempts to Oracle Essbase via T3 or IIOP protocols. Check logs for unusual connections or data access patterns. No specific commands are provided in the context.

Impact Analysis

An attacker could read, modify, or delete some Oracle Essbase data without authentication. This may disrupt system availability and compromise data integrity or confidentiality. The attack requires network access but no user interaction.

Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA due to unauthorized data access and modification risks. Unauthorized read, update, or delete access to Oracle Essbase data may lead to breaches of confidentiality (GDPR Article 5) or protected health information exposure (HIPAA). The partial denial of service also risks disrupting critical operations, potentially violating availability requirements in both standards.

Mitigation Strategies

Apply the latest Oracle Essbase security patches immediately. Restrict network access to T3 and IIOP ports for Oracle Essbase. Monitor for unauthorized data access or modifications. Disable unnecessary services if not required.

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EPSS Chart

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