CVE-2026-70688 in Essbase
Summary
by MITRE • 08/19/2026
Vulnerability in Oracle Essbase (component: Calculator). The supported version that is affected is 21.8.1.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in takeover of Oracle Essbase. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/19/2026
The identified vulnerability resides within the Calculator component of Oracle Essbase version 21.8.1.0.0, representing a critical security flaw that significantly compromises the integrity and availability of enterprise data analytics infrastructure. This specific module is responsible for performing complex calculations on multidimensional datasets, which are central to business intelligence operations managed by Essbase. The presence of this vulnerability indicates a fundamental failure in input validation or memory management within the calculation engine, allowing malicious actors to execute unauthorized actions with elevated privileges. Given that Oracle Essbase serves as a cornerstone for financial planning and analysis systems across numerous industries, such a flaw poses a severe risk to organizational data security and operational continuity.
The technical nature of this vulnerability allows exploitation by an attacker who possesses only low-level privileged access but has network connectivity via the HTTP protocol. This characteristic classifies the issue under CWE-20 Improper Input Validation or potentially CWE-434 Unrestricted Upload of File with Dangerous Type, depending on whether the exploit involves code injection through malformed calculation scripts or buffer overflow conditions triggered by specific data inputs. The attacker does not require user interaction to trigger the flaw, as indicated by the User Interface parameter being set to None in the CVSS vector. This lack of social engineering requirements makes the vulnerability particularly dangerous in automated attack scenarios where threat actors can script repeated attempts against vulnerable endpoints without needing to deceive end-users into clicking malicious links or opening infected files.
Successful exploitation leads directly to a complete takeover of the Oracle Essbase application environment, which corresponds to CWE-269 Improper Privilege Management and aligns with ATT&CK technique T1078 Valid Accounts if the attacker leverages compromised credentials obtained through initial low-level access. The impact is severe across all three pillars of the CIA triad: confidentiality, integrity, and availability. An adversary gaining control over Essbase can exfiltrate sensitive financial data, alter critical business metrics to manipulate decision-making processes, or disrupt services entirely by crashing the application servers. This level of compromise effectively neutralizes the security controls surrounding one of the most important repositories for structured analytical data within an organization's IT ecosystem.
The CVSS 3.1 base score of 8.8 reflects a High severity rating driven primarily by the high impact on confidentiality, integrity, and availability combined with low attack complexity and no required user interaction. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) confirms that while physical proximity or local access is not needed due to network accessibility, the attacker must have some form of authenticated access initially. This suggests that organizations relying on perimeter defenses alone are insufficiently protected against this threat vector. The scope remains unchanged (S:U), meaning the impact is largely confined to the Essbase instance itself rather than spreading immediately to other connected systems, although lateral movement from a compromised Essbase server would be a logical next step for an advanced persistent threat actor seeking broader network access.
Mitigation strategies must prioritize immediate patching of Oracle Essbase to the latest available version that addresses this specific calculator component flaw. Organizations should also implement strict input validation policies within their application development lifecycle if custom integrations with Essbase are utilized, ensuring that all data passed to calculation engines is sanitized and verified against expected formats. Network segmentation plays a crucial role in limiting exposure; administrators should restrict HTTP access to the Essbase management interfaces and API endpoints to only trusted IP ranges and authenticated administrative users where possible. Additionally, deploying Web Application Firewalls with rulesets tuned for detecting anomalous behavior patterns associated with buffer overflows or injection attacks can provide an additional layer of defense against exploitation attempts targeting this vulnerability before patches are applied in production environments.