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CVE-2026-70689 – Unauthenticated RCE / Full System Takeover – Oracle Essbase 21.8.1.0.0

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Summary

CVE-2026-70689 is a critical, easily exploitable vulnerability in the Infrastructure component of Oracle Essbase that allows an unauthenticated attacker with network access via HTTP to fully compromise the affected system. Oracle rates this as CRITICAL severity with a CVSS v3.1 base score of 9.8, and successful exploitation results in complete takeover of Oracle Essbase, impacting confidentiality, integrity, and availability.

Technical details

  • Root cause: Oracle’s advisory attributes the flaw to the "Infrastructure" sub-component of Essbase; Oracle has not published low-level technical root-cause details (e.g., specific code path or CWE) in the public CVE record.
  • Trigger conditions: The vulnerability is remotely reachable over HTTP and does not require any authentication, user interaction, or special privileges to trigger.
  • Attack vector: Network (AV:N) — an attacker only needs network access to the exposed Essbase HTTP interface.
  • Impact: Oracle describes the outcome as "takeover of Oracle Essbase," indicating an attacker can gain full control of the application/server, with high impact to confidentiality, integrity, and availability (C:H/I:H/A:H).

Affected software

  • Oracle Essbase version 21.8.1.0.0

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Apply the Oracle patch for Oracle Essbase issued in the Oracle Critical Security Patch Update – August 2026, which addresses this vulnerability. Organizations should update to the fixed release identified by Oracle for the 21.8.1.0.0 branch as specified in the advisory’s risk matrix.
  • If patching cannot be performed immediately: Restrict network exposure of the Essbase HTTP interface — do not expose it directly to the internet, and limit access to trusted internal networks or VPN-only access via firewall/ACL rules until the patch is applied.
  • Additional guidance: Monitor Essbase access logs for anomalous unauthenticated HTTP requests and review Oracle’s official Critical Security Patch Update advisory for any additional configuration-based mitigations specific to your deployment.

References

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