---
title: "CVE-2026-91651: Oracle Essbase - Authentication Bypass"
description: "Oracle Essbase 21.8.3.0.0 contains a vulnerability in Essbase Web Platform that allows low privileged attackers with network access via HTTP to compromise the system, potentially leading to full takeover, exploit requires network access with low privileges."
url: https://panop.io/threat-heartbeat/CVE-2026-91651/
---

# CVE-2026-91651 Oracle Essbase - Authentication Bypass

Oracle Essbase 21.8.3.0.0 contains a vulnerability in Essbase Web Platform that allows low privileged attackers with network access via HTTP to compromise the system, potentially leading to full takeover, exploit requires network access with low privileges.

CVSS base score 8.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91651)

## Details

Type

Authentication Bypass

Impact

Remote Code Execution, Information Disclosure, Data Tampering, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/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-2026-91651](https://nvd.nist.gov/vuln/detail/CVE-2026-91651)
- [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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