CVE-2026-91642

Modified Modified - Updated After Analysis

Oracle Essbase Security Bypass Vulnerability

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 unauthenticated attacker with network access via HTTP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Essbase accessible data as well as unauthorized read access to a subset 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 7.3 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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-2026-91642

EUVD

EUVD-2026-106829

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 an unauthenticated attacker with network access via HTTP to compromise the system. Successful exploitation can lead to unauthorized data access, modification, or deletion, as well as partial denial of service.

Detection Guidance

Detection of CVE-2026-91642 requires monitoring Oracle Essbase for unauthorized access attempts or unusual activity. Check HTTP logs for suspicious requests targeting the Oracle Essbase component. Verify if unauthenticated users can access or modify data. Ensure network traffic to port 80 (HTTP) is inspected for anomalies.

Impact Analysis

An attacker could read, modify, or delete sensitive data stored in Oracle Essbase. They might also disrupt system availability, causing partial outages. Since no authentication is required, the risk is high for any exposed instance.

Compliance Impact

This vulnerability could lead to unauthorized access or modification of regulated data, violating GDPR (data confidentiality) and HIPAA (protected health information integrity). Compliance failures may result in legal penalties or 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 network traffic for unusual activity targeting Essbase ports.

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