CVE-2026-91653 in Essbase
Summary
by MITRE • 10/21/2026
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).
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Analysis
by VulDB Data Team • 10/21/2026
The identified vulnerability resides within the Essbase Web Platform component of Oracle Essbase, specifically affecting version 21.8.3.0.0 and potentially other supported releases depending on configuration. This security flaw is characterized by its ease of exploitation, allowing an attacker with low privileges to achieve a significant compromise through network access via HTTP. The presence of this vulnerability indicates a critical weakness in the authentication or authorization mechanisms governing web-based interactions with the Essbase application server. Because the attack vector requires only low-privileged credentials and standard network connectivity without user interaction, it represents a high-risk entry point for malicious actors targeting enterprise data analytics environments.
The technical nature of this flaw leads to severe consequences regarding both confidentiality and integrity of the affected system's data assets. Successful exploitation enables an unauthorized attacker to gain access to critical business intelligence data that should remain restricted to authorized personnel only. Beyond mere information disclosure, the vulnerability also permits unauthorized modifications to the database state. This includes the ability to insert new records, update existing ones, or delete crucial datasets without proper authorization checks. Such capabilities fundamentally undermine the trustworthiness of the analytics platform and can lead to corrupted reporting structures or manipulated decision-making processes based on tampered data.
A critical aspect of this vulnerability is its potential for scope change, meaning that while the technical flaw exists within Oracle Essbase, the operational impact extends significantly beyond it. In many enterprise architectures, Essbase serves as a central hub connecting various downstream applications and user interfaces. Compromising Essbase can therefore serve as a pivot point to attack additional products or services integrated with it. This lateral movement capability amplifies the risk profile considerably, transforming what might appear as an isolated application flaw into a systemic threat capable of destabilizing multiple interconnected systems within the organization's IT infrastructure.
From a classification perspective, this vulnerability aligns closely with CWE-287 Improper Authentication and CWE-918 Server-Side Request Forgery (SSRF) or related web platform flaws depending on the specific implementation details not fully disclosed in the summary. The attack pattern corresponds to MITRE ATT&CK techniques involving Initial Access via valid accounts, specifically T1078 Valid Accounts, followed by Data Exfiltration under T1530 and potentially Data Manipulation under T1499 or similar integrity violation tactics. These mappings highlight the need for robust identity management controls and strict input validation within web-facing components of enterprise software suites.
To mitigate this risk, organizations must prioritize immediate patching to the latest stable release of Oracle Essbase that addresses this specific flaw in the Web Platform component. In addition to applying vendor-supplied updates, it is essential to enforce network segmentation strategies that restrict HTTP access to the Essbase web interface from untrusted networks or low-privilege user segments where possible. Implementing strict role-based access control policies ensures that only high-trust administrators can interact with sensitive configuration and data management endpoints. Furthermore, deploying Web Application Firewalls configured to detect anomalous request patterns associated with exploitation attempts can provide an additional layer of defense against automated attacks leveraging this vulnerability.