Unauthenticated Network Access Vulnerability in Oracle Essbase
CVE-2026-91665

9.8CRITICAL

Key Information:

Vendor

Oracle
Status
Oracle Essbase
Vendor
CVE Published:
20 October 2026

What is CVE-2026-91665?

A vulnerability in Oracle Essbase allows an unauthorized attacker to exploit network access via TCP, potentially leading to a complete takeover of the vulnerable system. This issue affects version 21.8.3.0.0, enabling unauthenticated remote access without the need for user interaction. If exploited, it poses significant risks to the confidentiality, integrity, and availability of the Oracle Essbase system, thus underlining the importance of implementing robust security measures.

Affected Version(s)

Oracle Essbase 21.8.3.0.0

References

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

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.