CVE-2026-91656

Modified Modified - Updated After Analysis

Oracle Essbase Federated Partitions Unauthorized Data Access

Publication date: 2026-10-20

Last updated on: 2026-10-27

Assigner: Oracle

Description

Vulnerability in Oracle Essbase (component: Federated Partitions). 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 unauthorized access to critical data or complete access to all Oracle Essbase accessible data as well as unauthorized update, insert or delete access to some 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 9.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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-2026-91656

EUVD

EUVD-2026-106843

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, specifically in the Federated Partitions component. It allows a low-privileged attacker with network access via HTTP to compromise the system. Successful exploitation can lead to unauthorized access to critical data, unauthorized data modifications, or partial denial of service.

Detection Guidance

Detecting this vulnerability requires checking for Oracle Essbase version 21.8.3.0.0 and monitoring for unauthorized access or modifications. Use Oracle's tools to verify the installed version and inspect network traffic for HTTP-based attacks targeting Essbase. No specific commands are provided in the context.

Impact Analysis

If exploited, this vulnerability could allow attackers to access sensitive data stored in Oracle Essbase, modify or delete data, or disrupt system availability. The impact includes confidentiality, integrity, and availability risks due to the high CVSS score of 9.1.

Compliance Impact

This vulnerability could lead to unauthorized access or disclosure of sensitive data, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Unauthorized data modification or deletion could also result in non-compliance with data integrity and availability standards.

Mitigation Strategies

Apply Oracle's official patches or updates for Essbase version 21.8.3.0.0. Restrict network access to Essbase via HTTP and enforce least privilege for user accounts. Monitor for suspicious activity and consider isolating affected systems until patched.

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