CVE-2026-91658

critical

Vulnerability in Oracle Essbase (component: Security).

Vendor / product: Oracle — essbase

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 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).

CVSS

9.9

9.9 (CVSS v3.1)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Severity source: NVD CVSS v3.1 (secalert_us@oracle.com)

Timeline (UTC)

Published: 2026-10-20 22:21

Modified: 2026-10-23 17:19

NVD status: Analyzed

Last synced 1 day ago

Verified against the source API 2026-10-27 07:05 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

oracle / essbase 21.8.3.0.0

Weakness classification (CWE)

CWE-284

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://www.oracle.com/security-alerts/cpuoct2026.html

References

https://www.oracle.com/security-alerts/cpuoct2026.html secalert_us@oracle.com

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 07:05 UTC · record ↗

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CVE-2026-91658

Affected products

Weakness classification (CWE)

Mitigation & advisories

References

Data sources

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