Security Vulnerability in Oracle Essbase by Oracle
CVE-2026-91655

9.1CRITICAL

Key Information:

Vendor

Oracle
Status
Oracle Essbase
Vendor
CVE Published:
20 October 2026

What is CVE-2026-91655?

A security vulnerability in Oracle Essbase allows low privileged attackers with network access via HTTP to compromise the system. This issue not only affects Oracle Essbase but also extends the potential for significantly impacting related products. If successfully exploited, attackers can gain unauthorized access to critical data, manipulate data via unauthorized updates, inserts, or deletions, and even cause partial denial of service, undermining the availability of the service.

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:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.