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Oracle Essbase EUVDEUVD-2026-106836

| CVE-2026-91649 MEDIUM
Improper Privilege Management (CWE-269)
2026-10-20 secalert_us@oracle.com GHSA-j5q4-c6vx-6779
6.0
CVSS 3.1 · Vendor: oracle
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Obtain high-privileged local logon on Essbase host
  2. Exploit
    Abuse Java Based Agent component
  3. Execution
    Leverage scope change to reach other products
  4. Impact
    Exfiltrate confidential data

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V8 - Authorization Least privilege enforcement
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires an interactive local logon to the infrastructure where Oracle Essbase 21.8.3.0.0 executes AND high existing privileges on that host (CVSS AV:L, PR:H); it targets the Java Based Agent component. There is no network vector and no user interaction. Limiting factors: the attacker must already be an authenticated, high-privileged local user, which substantially narrows the exploit population to insiders or attackers who have already achieved privileged footholds; impact is confined to confidentiality (no integrity or availability effect), though the scope change means disclosed data may include that of other products on the host.

Impact

This is a moderate-severity, local-privilege vulnerability that should be prioritized below internet-facing or unauthenticated flaws. The CVSS 3.1 vector (AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N, base 6.0) confirms the attacker must already have local logon access to the host running Oracle Essbase AND hold high privileges (PR:H) - so this is a privilege/scope-escalation issue affecting confidentiality only, not a remote entry point. The scope change (S:C) is the aggravating factor: a compromise can reach data in additional products beyond Essbase itself. No EPSS score, KEV listing, or public POC was provided in the input, so there is no public exploit identified at time of analysis and no evidence of active exploitation; this keeps real-world urgency low-to-moderate despite the confidentiality impact. The three signals are consistent (high access barrier, no exploitation intelligence) rather than conflicting. One caveat: the input Tags include 'Authentication Bypass', which directly contradicts the CVSS PR:H / 'high privileged attacker with logon' language - treat that tag as suspect and verify against the Oracle advisory rather than assuming any auth-bypass behavior.

Exploit ScenarioDerived

An attacker who already holds a high-privilege local account on the server hosting Oracle Essbase abuses the Java Based Agent component to read confidential data. Because the flaw carries a scope change, the compromise can extend to data managed by other co-located products, not just Essbase. No public exploit code is known, so exploitation would require a bespoke technique and pre-existing privileged access.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 20, 2026

High-privileged local users on hosts running Oracle Essbase 21.8.3.0.0 can obtain unauthorized read access to critical Essbase data through a flaw in the Java Based Agent component, and because the scope is changed the exposed data may include that of other products on the same host. The CVSS 3.1 score is 6.0 (AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N), a confidentiality-only impact that requires an existing interactive logon and administrator-level privileges rather than network reachability. No public exploit code or CISA KEV entry was identified at time of analysis, and patching is available through the referenced Oracle Critical Patch Update.

RemediationAI

Apply the Oracle Critical Patch Update for October 2026 to Oracle Essbase 21.8.3.0.0 as directed in the advisory at https://www.oracle.com/security-alerts/cpuoct2026.html; the input data does not provide an exact post-patch version string, so confirm the specific patched build and any required agent-side steps in that advisory before closing the finding. Because the exposure requires an existing privileged local account, the highest-value compensating control is to reduce the population that can satisfy it: restrict interactive logon and administrative group membership on Essbase hosts to a named, audited set of operators, and remove stale or shared privileged accounts, accepting that this tightens operational convenience for DBAs. Where feasible, isolate Essbase hosts from unrelated workloads so the scope change cannot expose other products' data on the same machine, at the cost of additional infrastructure segmentation. Until patching is complete, monitor and alert on unusual read activity by privileged local users against Essbase data directories and agent logs. Patch available per vendor advisory.

Affected VersionsENISA

Oracle Essbase 21.8.3.0.0

Affected Packages

euvd oracle_essbase no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Oracle Essbase is a multidimensional OLAP analytics server, and the Java Based Agent is the Java process that executes agent-side tasks on the Essbase infrastructure under the host operating system account assigned to it. The assessed vector is purely local (AV:L) with high privileges required (PR:H) and no user interaction (UI:N), so the flaw is reachable only by someone who already holds an interactive logon and administrative rights on the machine where the agent runs; it is not a network-facing or unauthenticated issue. The scope change (S:C) indicates the vulnerable component's privileges can cross a trust boundary, meaning data disclosed through the agent may extend beyond Essbase itself to other products hosted on the same system. Impact is limited to confidentiality (C:H with I:N/A:N), consistent with an authorization or access-control weakness in the agent rather than memory corruption; community tagging labels the issue an authentication bypass in the Java component, but the authoritative assessment confirms a local, high-privilege confidentiality exposure. No CWE identifier was assigned in the available data.

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Severity by source

Vendor (oracle) PRIMARY 6.0 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
vuln.today AI 6.0 MEDIUM

Requires local logon and high privileges on the Essbase host (AV:L, PR:H); low complexity, no UI; scope change with confidentiality-only impact (S:C, C:H, I/A:N).

3.1 AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
4.0 AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

DescriptionCVE.org

Vulnerability in Oracle Essbase (component: Java Based Agent). The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows high privileged attacker with logon to the infrastructure where Oracle Essbase executes 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. CVSS 3.1 Base Score 6.0 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N).

Threat Intelligence Overview

EPSS Score
0.2%
Top 95% exploitable
Prevalence
Medium
enterprise OLAP/analytics server, common in large orgs but not ubiquitous
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +30
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

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