CVE-2026-91638

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

EPSS Scores

Probability:
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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-2026-91638

EUVD

EUVD-2026-106825

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 affecting the Security component. It allows a low-privileged attacker with network access via HTTP to take over the system. The attack can impact additional products due to scope change. The CVSS score is 9.9, indicating severe impacts on confidentiality, integrity, and availability.

Detection Guidance

Detection requires checking for Oracle Essbase versions and exposed HTTP interfaces. Verify installed version with Oracle Essbase tools or logs. Monitor network traffic for unusual HTTP requests targeting Oracle Essbase ports. Check for unauthorized access attempts or privilege escalation in logs.

Impact Analysis

An attacker could exploit this to gain full control of Oracle Essbase, leading to unauthorized data access, modification, or deletion. Since attacks may affect additional products, the impact could extend beyond Essbase to other systems in the environment.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR and HIPAA requirements for data confidentiality and integrity. Organizations using Oracle Essbase may face compliance violations, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Apply the latest security patches from Oracle for Oracle Essbase version 21.8.3.0.0. Restrict network access to HTTP ports used by Oracle Essbase. Review and enforce least privilege access controls for users.

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EPSS Chart

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