Oracle Essbase: Privilege escalation and data access via Essbase Web Platform
Summary
Oracle Essbase, an analytics and multidimensional database, is affected in its Essbase Web Platform component, version 21.8.3.0.0 according to Oracle. An attacker with a low-privileged account and network access via HTTP can compromise the product, gaining unauthorized read access to critical data and limited unauthorized write, insert or delete access. The scope is changed, so impact may extend to other products; no user interaction is required.
Affected
- Oracle Essbase, Essbase Web Platform component, supported version 21.8.3.0.0
- Affected versions beyond 21.8.3.0.0 are not stated in the sources reviewed
Fixed in
Unknown. Check the Essbase section of the Oracle October 2026 Critical Patch Update advisory for the fixed release and patch ID.
Workaround
Unknown. No Oracle-published workaround was found for this CVE.
Exploitation
- No evidence of exploitation in the wild found at time of research
- CISA SSVC: Exploitation none, Automatable yes, Technical Impact partial
- No public proof-of-concept found; absence not confirmed
- CISA KEV listing not verified directly
Our recommendation
- Apply the Oracle October 2026 CPU patch for Essbase as soon as the fixed build is confirmed; patch CVE-2026-91651 (same component) together
- Do not expose the Essbase web interface to the internet; limit access to internal networks or VPN
- Enforce strong authentication and review low-privileged accounts
- Monitor logs for unusual access to Essbase data and check the CISA KEV catalog regularly
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Oracle Security Alerts - October 2026 CPU www.oracle.com
- Oracle October 2026 CPU release blog blogs.oracle.com
- OpenCVE CVE-2026-91653 app.opencve.io
- Strix CVE-2026-91653 www.strix.ai
- Waratek October 2026 CPU analysis waratek.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 10:18.
Original description (NVD)
Vulnerability in Oracle Essbase (component: Essbase Web Platform). 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. CVSS 3.1 Base Score 8.5 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N).
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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