CVE-2026-91655

Modified Modified - Updated After Analysis

Security Bypass 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. 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-2026-91655

EUVD

EUVD-2026-106842

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 within the Security 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, data manipulation, or partial denial of service.

Detection Guidance

Detection requires checking for Oracle Essbase versions and verifying network exposure. Use commands like 'curl -v http://<target>:<port>' to check HTTP access. Inspect logs for unusual HTTP requests targeting Oracle Essbase. Ensure firewall rules restrict HTTP access to Essbase ports.

Impact Analysis

An attacker could gain unauthorized access to sensitive data stored in Oracle Essbase, modify or delete data, or disrupt system availability. The impact includes confidentiality, integrity, and availability breaches with a CVSS score of 9.1, indicating high severity.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection requirements and HIPAA's security rules for protected health information. Non-compliance risks include legal penalties and reputational damage.

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. Monitor for unauthorized access attempts or unusual activity in Oracle Essbase logs.

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EPSS Chart

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