---
id: "CVE-2026-91643"
kind: "vulnerability"
aliases: ["CVE-2026-91643"]
title: "Oracle Essbase: Java Based Agent flaw leaks a subset of data"
severity: "medium"
cvss: 5.3
epss: 0.00251
exploited: false
status: "open"
category: "vendor"
products: [{"name": "oracle essbase", "fixed": [], "affected": "= 21.8.3.0.0", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["java", "on-prem", "oracle-essbase", "vendor"]
not_affected_if: ["agent-not-reachable", "other-essbase-versions"]
published_at: "2026-10-20T22:21:04+00:00"
first_seen_at: "2026-10-23T21:57:27+00:00"
updated_at: "2026-10-25T04:22:27+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91643", "first_seen_at": "2026-10-23T21:57:27+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91643", "first_seen_at": "2026-10-24T13:15:55+00:00"}]
---

# Oracle Essbase: Java Based Agent flaw leaks a subset of data

Oracle Essbase's Java Based Agent has a flaw that an unauthenticated attacker can reach over HTTP from the network. A successful attack gives read access to a subset of data Essbase can reach.

_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 the installed Essbase version against `21.8.3.0.0`, the affected version named in the sources
- Confirm whether the Java Based Agent component is running and reachable over HTTP from the network

## Fix

- Apply the Oracle Critical Patch Update that addresses this CVE (the fixed version is unknown from the sources)
- Restrict network access to the Java Based Agent endpoint until patched

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91643
- 2026-10-24T13:15:55+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91643

## From the sources

Vulnerability in Oracle Essbase (component: Java Based Agent).   The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Essbase.  Successful attacks of this vulnerability can result in  unauthorized read access to a subset of Oracle Essbase accessible data. CVSS 3.1 Base Score 5.3 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_