CVE-2026-91663

Analyzed Analyzed - Analysis Complete

Oracle Essbase Remote Code Execution Vulnerability

Publication date: 2026-10-20

Last updated on: 2026-10-23

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 T3, IIOP 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 takeover of Oracle Essbase. CVSS 3.1 Base Score 9.9 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-10-23

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-91663

EUVD

EUVD-2026-106850

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 critical vulnerability in Oracle Essbase version 21.8.3.0.0 within the Security component. It allows a low-privileged attacker with network access via T3 or IIOP protocols to compromise the system. Successful exploitation could lead to complete takeover of Oracle Essbase and potentially impact other connected products.

Detection Guidance

Detection requires checking for Oracle Essbase versions and exposed T3/IIOP ports. Verify Essbase version via logs or admin console. Scan for open ports 9000 (T3) or 20000 (IIOP) using netstat or nmap. Check for unauthorized access attempts in Essbase logs.

Impact Analysis

An attacker could gain full control over your Oracle Essbase system, leading to unauthorized data access, modification, or deletion. This could disrupt business operations and expose sensitive information stored in Essbase.

Compliance Impact

This vulnerability could lead to unauthorized access or disclosure of regulated data, violating GDPR, HIPAA, or other compliance requirements. Organizations may face legal penalties, reputational damage, and loss of customer trust due to non-compliance.

Mitigation Strategies

Apply the latest security patches from Oracle for Oracle Essbase version 21.8.3.0.0. Restrict network access to T3 and IIOP ports. Review and enforce least privilege for user accounts. Monitor for unusual activity in Oracle Essbase services.

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