CVE-2026-91665 Vulnerability in Oracle Essbase (component: Security).

Critical 9.8 Published 20 Oct 2026 Updated 22 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-91665?

CVE-2026-91665 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 unauthenticated attacker with network access via TCP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in takeover of Oracle Essbase. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-306, CWE-287

Which versions are affected by CVE-2026-91665?

It affects 1 product.

Products include Oracle Essbase.

How do I fix CVE-2026-91665?

No fix has been published for CVE-2026-91665 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-91665 being exploited?

There is no known exploitation of CVE-2026-91665 in the wild and no public exploit code.

All Oracle Essbase vulnerabilities

Sources

Also known as GHSA-6w29-5x85-gw26.