CVE-2026-91655 Vulnerability in Oracle Essbase (component: Security).

Critical 9.1 Published 20 Oct 2026 Updated 27 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-91655?

CVE-2026-91655 is a critical vulnerability in Oracle Essbase, published on 20 Oct 2026.

Official 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).

Weakness: CWE-284

Which versions are affected by CVE-2026-91655?

It affects 1 product.

Products include Oracle Essbase.

How do I fix CVE-2026-91655?

No fix has been published for CVE-2026-91655 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-91655 being exploited?

There is no known exploitation of CVE-2026-91655 in the wild and no public exploit code.

All Oracle Essbase vulnerabilities

Sources

Also known as GHSA-6mw7-mcpr-3q6v.