High severity · published Oct 20, 2026
CVE-2026-91647
Vulnerability in Oracle Essbase (component: Security)
8.1
CVSS
0.3%
EPSS
No
On KEV
Description
Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0. Difficult to exploit vulnerability allows unauthenticated attacker with network access via TCP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in takeover of Oracle Essbase. CVSS 3.1 Base Score 8.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OE
Oracle Essbase · Oracle Corporation
21.8.3.0.0 · source: vendor
ES
Essbase · Oracle
21.8.3.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91647
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91647
Vendor Advisory
https://www.oracle.com/security-alerts/cpuoct2026.html
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