CVE-2026-91655

CRITICAL

Summary

generated automatically from NVD data

CVE-2026-91655 affects the Security component of Oracle Essbase, specifically version 21.8.3.0.0. A low-privileged attacker with network access over HTTP can easily exploit it, and the impact may extend to additional products because of a scope change. Successful exploitation can expose all data accessible to Essbase, permit limited modification or deletion of data, and cause a partial denial of service. The CVSS 3.1 base score is 9.1 (CRITICAL).

NVD 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. While the vulnerability is in Oracle Essbase, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Essbase accessible data as well as unauthorized update, insert or delete access to some of Oracle Essbase accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Essbase. CVSS 3.1 Base Score 9.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L).

EPSS · FIRST.org

0.21%probability of exploitation in the next 30 days

Higher than 10% of scored CVEs

EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-21, recomputed daily by FIRST.org.

In-depth analysis on cveo.tech

We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.