CVE-2026-91658

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 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 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-2026-91658

EUVD

EUVD-2026-106845

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 HTTP 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 HTTP interfaces. Verify installed versions with commands like 'opatch lsinventory' or check Essbase logs for unusual activity. Monitor network traffic for HTTP requests targeting Essbase ports (default 9000, 9001).

Impact Analysis

An attacker could gain full control over Oracle Essbase, leading to unauthorized access, data theft, or system manipulation. This could disrupt business operations, expose sensitive data, and allow further attacks on dependent systems.

Compliance Impact

This vulnerability could lead to unauthorized data access or breaches, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations may face legal penalties, fines, and reputational damage due to non-compliance.

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.

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