# CVE-2026-91642: Oracle Essbase unauthenticated data access and denial of service

Source: https://junglewise.ai/threats/cve-2026-91642-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-2026-91642 · Severity: high · CVSS 7.3 · Published 2026-10-20

Oracle Essbase is a business analytics platform used to manage financial consolidation and planning data. An unauthenticated attacker on the network can exploit an easy-to-exploit vulnerability in the Security component to read, modify, and delete sensitive data, or cause partial service outages without needing to log in or interact with users.

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

## Quick answers

**Is CVE-2026-91642 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91642 being exploited in the wild.

**How severe is CVE-2026-91642?** High severity, with a CVSS score of 7.3, published 20 October 2026.

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

**Is there a fix for CVE-2026-91642?** 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-2026-91642 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-91642?** 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 unauthenticated network-based vulnerability in Oracle Essbase 21.8.3.0.0 allows arbitrary data access and modification via the HTTP interface with no authentication or user interaction required. The vulnerability affects the Security component and results in unauthorized read and write access to Essbase data as well as the ability to cause partial denial of service. No patched version information is disclosed in the advisory.

## 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)