---
id: "CVE-2026-91653"
kind: "vulnerability"
aliases: ["CVE-2026-91653"]
title: "Oracle Essbase: low-privilege web flaw exposes critical data over HTTP"
severity: "high"
cvss: 8.5
epss: 0.00195
exploited: false
status: "open"
category: "vendor"
products: [{"name": "oracle essbase", "fixed": [], "affected": "= 21.8.3.0.0", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["enterprise", "oracle-essbase", "self-hosted", "vendor"]
not_affected_if: ["essbase-not-deployed"]
published_at: "2026-10-20T22:21:05+00:00"
first_seen_at: "2026-10-23T21:57:27+00:00"
updated_at: "2026-10-25T03:00:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91653", "first_seen_at": "2026-10-23T21:57:27+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91653", "first_seen_at": "2026-10-24T13:15:55+00:00"}]
---

# Oracle Essbase: low-privilege web flaw exposes critical data over HTTP

Oracle Essbase's Web Platform component has a flaw that lets a low-privileged user reach data over HTTP without user interaction. An attacker can read all data Essbase can access and modify or delete some of it, with scope change affecting other products.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:oracle essbase affected = 21.8.3.0.0 fixed ?

## How to check

- Check whether Oracle Essbase is deployed and which version runs, against `21.8.3.0.0`
- unknown

## Fix

- Apply the Oracle Critical Patch Update fix for Essbase; the fixed version is unknown from the sources
- unknown

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91653
- 2026-10-24T13:15:55+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91653

## From the sources

Vulnerability in Oracle Essbase (component: Essbase Web Platform).   The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Essbase.  While the vulnerability is in Oracle Essbase, attacks may significantly impact additional products (scope change).  Successful attacks of this vulnerability can result in  unauthorized access to critical data or complete access to all Oracle Essbase accessible data as well as  unauthorized update, insert or delete access to some of Oracle Essbase accessible data. CVSS 3.1 Base Score 8.5 (Confidentiality and Integrity impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N).

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