---
title: "CVE-2026-91635: Oracle Essbase - Remote Code Execution"
description: "Oracle Essbase 21.8.3.0.0 contains a security vulnerability allowing unauthenticated attackers with network access via T3, IIOP to compromise the system, potentially leading to full takeover, exploit requires network access with high complexity."
url: https://panop.io/threat-heartbeat/CVE-2026-91635/
---

# CVE-2026-91635 Oracle Essbase - Remote Code Execution

Oracle Essbase 21.8.3.0.0 contains a security vulnerability allowing unauthenticated attackers with network access via T3, IIOP to compromise the system, potentially leading to full takeover, exploit requires network access with high complexity.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91635)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

20 October 2026

Updated

21 October 2026

## Vendor fix

Update to the latest available version beyond 21.8.3.0.0.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91635](https://nvd.nist.gov/vuln/detail/CVE-2026-91635)
- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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