CVE-2026-91649 in Essbase
Summary
by MITRE • 10/22/2026
Vulnerability in Oracle Essbase (component: Java Based Agent). The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows high privileged attacker with logon to the infrastructure where Oracle Essbase executes 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 6.0 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/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 Java Based Agent component of Oracle Essbase, specifically affecting version 21.8.3.0.0 and potentially other supported releases depending on configuration. This security flaw is classified as an easily exploitable issue that requires a high-privileged attacker to have valid logon credentials to the infrastructure where Oracle Essbase executes. The presence of this vulnerability indicates a significant weakness in how the Java agent handles authentication or session management, allowing an authenticated user with elevated privileges to bypass intended access controls. This scenario aligns closely with CWE-269, which describes Improper Privilege Management, as well as CWE-732, concerning Incorrect Permission Assignment for Critical Resource. The attacker does not need any user interaction to exploit this flaw, making it a straightforward target for insiders or compromised accounts that have achieved high-level access within the system environment.
The operational impact of successfully exploiting this vulnerability is severe due to its scope change characteristics. While the technical root cause lies within Oracle Essbase, the attack vector allows the adversary to compromise additional products and services connected to the same infrastructure. This lateral movement capability means that a breach in Essbase can serve as a pivot point for broader network intrusion. The primary consequence of this exploitation is unauthorized access to critical data stored within the Essbase environment. According to the provided CVSS 3.1 metrics, the impact on confidentiality is high, while integrity and availability remain unaffected in the base score calculation. This suggests that the attacker can read sensitive business intelligence data, financial models, or strategic planning information without altering or destroying it, which is consistent with stealthy espionage activities often seen in advanced persistent threat campaigns.
From a tactical perspective, this vulnerability maps to MITRE ATT&CK techniques related to Credential Access and Data Staged or Exfiltration over C2 channels if the attacker proceeds beyond initial access. The requirement for high-privileged logon means that attackers typically rely on prior compromise of administrative accounts, phishing attacks targeting privileged users, or exploitation of other vulnerabilities to gain these credentials first. Once inside, the Java Based Agent serves as a conduit for accessing underlying data stores. Organizations must recognize that even if Essbase itself is not directly exposed to external networks, internal network segmentation failures can allow high-privileged attackers from adjacent systems to reach this component. The lack of user interaction requirement further lowers the barrier to entry for automated exploitation tools once credentials are obtained.
Mitigation strategies should focus on both technical controls and administrative policies. Oracle has likely released patches or updates that address the specific flaw in the Java Based Agent; applying these updates immediately is the primary remediation step. In addition to patching, organizations must enforce strict least-privilege principles across all infrastructure components. This includes auditing high-privileged accounts for unusual activity and ensuring that service accounts used by Essbase do not possess unnecessary administrative rights on the host operating system or database layer. Network segmentation should be reviewed to ensure that only authorized application servers can communicate with the Java Based Agent, thereby limiting the attack surface available to potential internal attackers. Furthermore, implementing multi-factor authentication for all high-privileged logons adds a critical layer of defense against credential theft scenarios that precede this exploitation. Continuous monitoring and logging of access attempts to Essbase resources will aid in detecting suspicious behavior indicative of an ongoing exploit attempt before significant data compromise occurs.