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9.9

Oracle Essbase can be taken over by low‑privilege attacker

CVE-2026-91638 · published 12 days ago
Summary

The 21.8.3.0.0 version of Oracle Essbase allows anyone with basic network access over HTTP to gain full control of the system. This could let an attacker read, change, or disrupt your data and affect other linked applications. Apply the vendor's security update or patches as soon as possible to block the exploit.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
oracle corporation oracle essbase 21.8.3.0.0
Original advisory text
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 vi...
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 takeover of Oracle Essbase. CVSS 3.1 Base Score 9.9 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.9 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-284Improper Access Control
Timeline
Published20 Oct 2026
Updated29 Oct 2026
First seen20 Oct 2026
Sources
CVE-2026-91638 · NVD
CVE-2026-91638 · MITRE
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