# CVE-2026-91655: Oracle Essbase privilege escalation via HTTP

Source: https://junglewise.ai/threats/cve-2026-91655-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-2026-91655 · Severity: critical · CVSS 9.1 · Published 2026-10-20

Oracle Essbase is an analytics and planning platform used in enterprise data management. A vulnerability in its security component allows low-privileged network users to gain unauthorized access to sensitive data, modify records, and disrupt service. Attackers can exploit this over standard HTTP connections without any special setup, posing a critical risk to organizations storing financial and operational data in Essbase.

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

## Quick answers

**Is CVE-2026-91655 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91655 being exploited in the wild.

**How severe is CVE-2026-91655?** Critical severity, with a CVSS score of 9.1, published 20 October 2026.

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

**Is there a fix for CVE-2026-91655?** 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-2026-91655 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-91655?** 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

A network-reachable privilege escalation vulnerability exists in the security component of Oracle Essbase 21.8.3.0.0. Low-privileged attackers with network access via HTTP can exploit this without user interaction to read, modify, or delete data, and cause partial denial of service. The vulnerability has scope change, meaning successful exploitation can impact connected systems beyond Essbase itself.

## 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 unauthenticated remote code execution](https://junglewise.ai/threats/cve-2026-91665-vulnerability-in-oracle-essbase-component-security-the-supported)
- [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)