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9.9
CVE-2026-91663: Oracle Essbase can be taken over by low‑privilege attacker
CVE-2026-91663 · published 12 days ago
Summary
A flaw in Oracle Essbase version 21.8.3.0.0 lets someone with limited rights on the network access the system and gain full control. This could let an attacker disrupt or steal data from Essbase and any connected applications. Apply the vendor's security update as soon as possible to block the risk.
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
| Vendor | Product | Affected 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 T3, IIOP 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).
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker full control
Type
CWE-284Improper Access Control
Timeline
Published20 Oct 2026
Updated31 Oct 2026
First seen20 Oct 2026
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