CVE-2026-91660

Modified Modified - Updated After Analysis

Denial of Service 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. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Essbase. CVSS 3.1 Base Score 4.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-2026-91660

EUVD

EUVD-2026-106847

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	essbase	21.8.3.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This is a 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 partially disrupt Oracle Essbase services, causing a denial of service (DOS). The attack does not require user interaction and does not lead to unauthorized data access or modification.

Detection Guidance

Detection requires checking for Oracle Essbase versions and monitoring for partial denial of service conditions. Verify installed versions with Oracle Essbase tools or logs. Monitor network traffic for unusual HTTP requests targeting Essbase components. Check for partial service disruptions in Essbase services.

Impact Analysis

If exploited, this vulnerability could cause partial unavailability of Oracle Essbase services, leading to disruptions in data processing or analytics tasks. It does not directly expose sensitive data but may impact operational efficiency and service reliability.

Compliance Impact

This vulnerability causes partial denial of service in Oracle Essbase, which may disrupt data availability. For GDPR, this could impact access to personal data, potentially violating Article 32 (security of processing). For HIPAA, it may affect availability of protected health information, risking compliance with the Security Rule.

Mitigation Strategies

Apply the latest security patches from Oracle for Essbase version 21.8.3.0.0 to address the vulnerability. Restrict network access to Oracle Essbase via HTTP to trusted sources only. Monitor network traffic for unusual activity targeting the Oracle Essbase service.

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