Medium severity · published Oct 20, 2026
CVE-2026-91660
Vulnerability in Oracle Essbase (component: Security)
4.3
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. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Essbase. CVSS 3.1 Base Score 4.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% 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-2026-91660
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91660
Vendor Advisory
https://www.oracle.com/security-alerts/cpuoct2026.html
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