CVE-2026-91660: Oracle Essbase denial of service in Security component

CVE-2026-91660 · Severity: medium · CVSS 4.3 · Published 2026-10-20

Oracle Essbase is a business analytics and planning platform used to manage corporate financial data and forecasts. A flaw in the Security component allows an attacker with low-level network access to partially disrupt the service, causing partial outages. An attacker with valid credentials can trigger this denial of service remotely over HTTP.

Technologies: Oracle Essbase. Vendors: Oracle.

Quick answers

Is CVE-2026-91660 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-91660 being exploited in the wild.
How severe is CVE-2026-91660?
Medium severity, with a CVSS score of 4.3, published 20 October 2026.
Which products and versions are affected?
Oracle Essbase 21.8.3.0.0.
Is there a fix for CVE-2026-91660?
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-2026-91660 attacked?
It is attacked over the network.
Am I affected by CVE-2026-91660?
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

The vulnerability is an easily exploitable denial of service in Oracle Essbase's Security component, accessible via HTTP to low-privileged users. An authenticated attacker with network access can trigger a partial denial of service affecting availability. A fix status has not been publicly disclosed in the available advisory material.

Affected products

  • Oracle Essbase 21.8.3.0.0

Timeline

  • 2026-10-20: disclosed

References

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