CVE-2026-91639 Vulnerability in Oracle Essbase (component: Security).

High 7.7 Published 20 Oct 2026 Updated 27 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-91639?

CVE-2026-91639 is a high-severity 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. CVSS 3.1 Base Score 7.7 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N).

Weakness: CWE-200

Which versions are affected by CVE-2026-91639?

It affects 1 product.

Products include Oracle Essbase.

How do I fix CVE-2026-91639?

No fix has been published for CVE-2026-91639 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-91639 being exploited?

There is no known exploitation of CVE-2026-91639 in the wild and no public exploit code.

All Oracle Essbase vulnerabilities

Sources

Also known as GHSA-q6m7-6mc8-xx9m.