CVE-2026-91657

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 low privileged attacker with network access via HTTP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle Essbase accessible data. CVSS 3.1 Base Score 4.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).

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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-2026-91657

EUVD

EUVD-2026-106844

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	essbase	21.8.3.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Essbase, specifically in the Security component. It affects version 21.8.3.0.0 and allows a low-privileged attacker with network access via HTTP to read some of the data stored in Oracle Essbase. The impact is limited to unauthorized read access to a subset of accessible data.

Detection Guidance

Detection requires checking for Oracle Essbase instances exposed to HTTP with low-privilege access. Verify network exposure via port scans (e.g., nmap -p 80,443 <target>). Inspect Oracle Essbase logs for unusual read requests to sensitive data. Ensure access controls restrict low-privilege users from accessing unauthorized data subsets.

Impact Analysis

If you use Oracle Essbase version 21.8.3.0.0, an attacker could exploit this vulnerability to gain unauthorized read access to some of your Oracle Essbase data. This could lead to exposure of sensitive information stored in the system.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under regulations like GDPR or HIPAA. Unauthorized data exposure could result in legal penalties or loss of trust.

Mitigation Strategies

Apply the latest security patches from Oracle for 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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