# CVE-2026-91643: Oracle Essbase unauthorized read access in Java Based Agent

Source: https://junglewise.ai/threats/cve-2026-91643-vulnerability-in-oracle-essbase-component-java-based-agent-the  
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-2026-91643 · Severity: medium · CVSS 5.3 · Published 2026-10-20

Oracle Essbase is a financial consolidation and planning platform used by enterprises to manage multi-dimensional data. An unauthenticated attacker on the network can exploit this vulnerability via HTTP to gain unauthorized read access to sensitive data stored in Essbase without requiring credentials or user interaction.

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

## Quick answers

**Is CVE-2026-91643 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91643 being exploited in the wild.

**How severe is CVE-2026-91643?** Medium severity, with a CVSS score of 5.3, published 20 October 2026.

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

**Is there a fix for CVE-2026-91643?** 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-2026-91643 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-91643?** 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 information disclosure vulnerability exists in the Java Based Agent component of Oracle Essbase 21.8.3.0.0. The flaw allows unauthenticated attackers with network access to read a subset of data through HTTP requests, requiring no authentication, low complexity attack complexity, and no user interaction.

## 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)