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    CVE-2026-91651

    Vulnerability in Oracle Essbase (component: Essbase Web Platform). The supported version that is affected is 21.8.3.0.0. Difficult to exploit 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 takeover of Oracle Essbase. CVSS 3.1 Base Score 8.5 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H).

    Published:Oct 20, 2026
    Last Modified:Oct 23, 2026
    EPS:Oct 20, 2026
    EPSS Score:0.003
    CVSS Score:8.5

    Affected Products

    Vendor
    Oracle
    Product
    Essbase

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-114 Authentication Abuse
    CAPEC-115 Authentication Bypass
    CAPEC-151 Identity Spoofing
    CAPEC-19 Embedding Scripts within Scripts
    CAPEC-194 Fake the Source of Data
    CAPEC-22 Exploiting Trust in Client
    CAPEC-441 Malicious Logic Insertion
    CAPEC-478 Modification of Windows Service Configuration
    CAPEC-479 Malicious Root Certificate
    CAPEC-502 Intent Spoof
    CAPEC-503 WebView Exposure
    CAPEC-536 Data Injected During Configuration
    CAPEC-546 Incomplete Data Deletion in a Multi-Tenant Environment
    CAPEC-550 Install New Service
    CAPEC-551 Modify Existing Service
    CAPEC-552 Install Rootkit
    CAPEC-556 Replace File Extension Handlers
    CAPEC-558 Replace Trusted Executable
    CAPEC-562 Modify Shared File
    CAPEC-563 Add Malicious File to Shared Webroot
    CAPEC-564 Run Software at Logon
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-578 Disable Security Software
    CAPEC-593 Session Hijacking
    CAPEC-633 Token Impersonation
    CAPEC-650 Upload a Web Shell to a Web Server
    CAPEC-94 Adversary in the Middle (AiTM)

    Related CVEs

    CVE-2026-91665 (CVSS 9.8) — Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0.…
    CVE-2026-91664 (CVSS 7.5) — Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0.…
    CVE-2026-91663 (CVSS 9.9) — Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0.…
    CVE-2026-91662 (CVSS 6.4) — Vulnerability in Oracle Essbase (component: Java Based Agent). The supported version that is affected is 21.…
    CVE-2026-91661 (CVSS 7.7) — Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0.…
    CVE-2026-91660 (CVSS 4.3) — Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0.…
    CVE-2026-91659 (CVSS 7.7) — Vulnerability in Oracle Essbase (component: Build). The supported version that is affected is 21.8.3.0.0. Ea…
    CVE-2026-91658 (CVSS 9.9) — Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0.…
    CVE-2026-91657 (CVSS 4.3) — Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0.…
    CVE-2026-91656 (CVSS 9.1) — Vulnerability in Oracle Essbase (component: Federated Partitions). The supported version that is affected is…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High