CVE-2026-91655

Exploitable Privilege Validation Vulnerability in Oracle Essbase 21.8.3.0.0 Allows Unauthorized Data Access and Denial of Service

Published Oct 20, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
Vulnerability in Oracle Essbase (component: Security). 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 and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Essbase. CVSS 3.1 Base Score 9.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L).

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Exploitable Privilege Validation Vulnerability in Oracle Essbase 21.8.3.0.0 Allows Unauthorized Data Access and Denial of Service
Weaknesses CWE-284
Type Values Removed Values Added
Title Low‑Privilege HTTP Remote Exploit in Oracle Essbase Security Component
Weaknesses CWE-284
Type Values Removed Values Added
Weaknesses NVD-CWE-noinfo
Type Values Removed Values Added
Title Low‑Privilege HTTP Remote Exploit in Oracle Essbase Security Component
Weaknesses CWE-284
Type Values Removed Values Added
Description Vulnerability in Oracle Essbase (component: Security). 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 and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Essbase. CVSS 3.1 Base Score 9.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L).
First Time appeared Oracle
Oracle essbase
CPEs cpe:2.3:a:oracle:essbase:21.8.3.0.0:*:*:*:*:*:*:*
Vendors & Products Oracle
Oracle essbase
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
oracle
Published
Updated
Oct 27, 2026, 1:16 PM
Reserved
Sep 14, 2026, 10:10 PM
Status
Modified
Published
Oct 20, 2026, 10:21 PM
Modified
Oct 27, 2026, 2:17 PM