Is CVE-2026-91653 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91653 being exploited in the wild.

How severe is CVE-2026-91653?

High severity, with a CVSS score of 8.5, published 20 October 2026.

Is there a fix for CVE-2026-91653?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-91653 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-91653?

Check whether you run Oracle Essbase at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-91653: Oracle Essbase privilege escalation in Web Platform

CVE-2026-91653 · Severity: high · CVSS 8.5 · Published 2026-10-20

Oracle Essbase is a financial planning and analytics platform used by enterprises to manage and consolidate business data. A vulnerability in the Essbase Web Platform allows a low-privileged network attacker to gain unauthorized access to sensitive financial data and modify critical information. Successful exploitation could expose or compromise confidential business data and impact other connected systems.

Technologies: Oracle Essbase. Vendors: Oracle.

Quick answers

Is CVE-2026-91653 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91653 being exploited in the wild.
How severe is CVE-2026-91653?: High severity, with a CVSS score of 8.5, published 20 October 2026.
Which products and versions are affected?: Oracle Essbase 21.8.3.0.0.
Is there a fix for CVE-2026-91653?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-91653 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-91653?: Check whether you run Oracle Essbase at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This is a scope-change vulnerability in Oracle Essbase's Web Platform component affecting version 21.8.3.0.0. The vulnerability is easily exploitable via HTTP by an authenticated network attacker with low privileges (PR:L), allowing them to escalate access to critical data and make unauthorized modifications (C:H, I:L impacts). A fix status has not been confirmed in the available advisory information.

Affected products

Oracle Essbase 21.8.3.0.0

Timeline

2026-10-20: disclosed

References

https://www.oracle.com/security-alerts/cpuoct2026.html

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