CVE-2026-91632 in Essbase
Summary
by MITRE • 10/22/2026
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 unauthorized access to critical data or complete access to all Oracle Essbase accessible data. CVSS 3.1 Base Score 7.7 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N).
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Analysis
by VulDB Data Team • 10/22/2026
The identified vulnerability resides within the Security component of Oracle Essbase, specifically affecting version 21.8.3.0.0 and potentially other supported releases depending on configuration. This flaw represents a critical security deficiency that allows for unauthorized access to sensitive information stored within the application environment. The nature of this vulnerability is characterized by its ease of exploitation, requiring only low-privileged credentials and network connectivity via HTTP to initiate an attack vector. This significantly lowers the barrier to entry for malicious actors who may otherwise lack high-level administrative privileges or complex exploit development capabilities.
From a technical perspective, the flaw likely involves improper access control mechanisms within the Essbase security architecture. When users authenticate with standard user rights, they are able to traverse permission boundaries that should restrict their view of data. This misconfiguration enables attackers to query and retrieve critical datasets without authorization. The use of HTTP as the transport protocol indicates that this vulnerability can be exploited over a network connection, potentially allowing remote exploitation if the service is exposed or accessible within an internal network segment where lateral movement has occurred.
The operational impact of this vulnerability is severe due to its high confidentiality rating in the CVSS 3.1 scoring system, which assigns a base score of 7.7. Successful exploitation results in unauthorized access to critical data and can lead to complete compromise of all Oracle Essbase accessible data. This level of exposure poses significant risks to organizations relying on Essbase for business intelligence, financial planning, and performance management. The leakage of such data can result in competitive disadvantage, regulatory non-compliance, and loss of customer trust. Furthermore, the note regarding scope change indicates that attacks targeting this vulnerability may significantly impact additional products within the Oracle ecosystem, suggesting potential privilege escalation or cross-application exploitation paths that extend beyond the immediate Essbase instance.
In terms of industry standards classification, this vulnerability aligns with CWE-269 Improper Privilege Management and CWE-862 Missing Authorization. These categories highlight failures in enforcing user roles and permissions correctly. From an adversarial tactics perspective, as defined by MITRE ATT&CK, this behavior corresponds to T1078 Valid Accounts, where attackers use legitimate credentials to gain access, followed by T1530 Data from Cloud Storage or similar data exfiltration techniques depending on the specific mechanism of data retrieval within Essbase. The network-based nature via HTTP also relates to initial access vectors that do not require user interaction, fitting into automated exploitation scenarios.
Mitigation strategies must prioritize immediate patching and configuration hardening. Organizations should apply the latest security patches provided by Oracle for version 21.8.3.0.0 as soon as they are available in a tested environment. Until patches are applied, network segmentation is critical; ensure that Essbase services are not exposed to untrusted networks via HTTP. If possible, migrate access to HTTPS with strong certificate validation to add an additional layer of security and integrity checking. Additionally, review user roles and permissions within the Essbase application to enforce the principle of least privilege, ensuring that low-privileged users have minimal data visibility. Regular audits of authentication logs should be conducted to detect any anomalous access patterns indicative of exploitation attempts.