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    CVE-2026-91663

    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 T3, IIOP 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 9.9 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/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:0.00286
    CVSS Score:9.9

    Affected Products

    Vendor
    Oracle
    Product
    Essbase

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-284 Improper Access Control

    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-2026-91662 (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…
    CVE-2026-91655 (CVSS 9.1) — Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0.…

    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