# CVE-2026-91665: Oracle Essbase unauthenticated remote code execution

Source: https://junglewise.ai/threats/cve-2026-91665-vulnerability-in-oracle-essbase-component-security-the-supported  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-91665 · Severity: critical · CVSS 9.8 · Published 2026-10-20

Oracle Essbase is a financial planning and analysis platform used by enterprises to manage budgets and performance data. An unauthenticated attacker with network access can exploit a security vulnerability to gain complete control of the Essbase system, potentially compromising all data, operations, and availability. This is a critical remote vulnerability requiring no authentication or user interaction.

Technologies: [Oracle Essbase](https://junglewise.ai/threats/technologies/essbase). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-91665 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91665 being exploited in the wild.

**How severe is CVE-2026-91665?** Critical severity, with a CVSS score of 9.8, published 20 October 2026.

**Which products and versions are affected?** Oracle Essbase 21.8.3.0.0.

**Is there a fix for CVE-2026-91665?** 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-2026-91665 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-91665?** 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

An easily exploitable vulnerability in Oracle Essbase's security component allows unauthenticated remote code execution via the network (TCP). The vulnerability requires no authentication, low complexity to exploit, and no user interaction. Successful exploitation results in complete compromise of the system with impact to confidentiality, integrity, and availability.

## Affected products

- Oracle Essbase 21.8.3.0.0

## Timeline

- 2026-10-20: disclosed

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

## Related threats

- [Oracle Essbase denial of service in Security component](https://junglewise.ai/threats/cve-2026-91664-vulnerability-in-oracle-essbase-component-security-the-supported)
- [Oracle Essbase privilege escalation in Security component](https://junglewise.ai/threats/cve-2026-91663-vulnerability-in-oracle-essbase-component-security-the-supported)
- [Oracle Essbase privilege escalation in Java Based Agent](https://junglewise.ai/threats/cve-2026-91662-vulnerability-in-oracle-essbase-component-java-based-agent-the)
- [Oracle Essbase authentication bypass in security component](https://junglewise.ai/threats/cve-2026-91661-vulnerability-in-oracle-essbase-component-security-the-supported)
- [Oracle Essbase denial of service in Security component](https://junglewise.ai/threats/cve-2026-91660-vulnerability-in-oracle-essbase-component-security-the-supported)