CVE-2026-91659 Oracle Essbase - Broken Access Control

Oracle Essbase 21.8.3.0.0 contains an unauthorized access vulnerability caused by a flaw in the Build component, letting low privileged attackers with network access via HTTP access critical or all accessible data, exploit requires low privileges and network access.

CVSS base score 7.7 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Published
20 October 2026
Updated
21 October 2026

Vendor fix

Update to the latest available version beyond 21.8.3.0.0.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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