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CVE-2026-91638 is a critical vulnerability in the Security component of Oracle Essbase affecting supported version 21.8.3.0.0. A low-privileged attacker with HTTP network access can exploit it with low attack complexity and without user interaction to take over Oracle Essbase. Exploitation may significantly affect additional products beyond Essbase. The vulnerability has a CVSS 3.1 base score of 9.9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H). The underlying weakness and vulnerable function are not specified.
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A critical vulnerability in the Security component of Oracle Essbase 21.8.3.0.0 allows a low-privileged attacker with HTTP network access to take over Oracle Essbase without user interaction. Exploitation can significantly affect additional, unspecified products. The CVSS 3.1 score is 9.9, with high confidentiality, integrity, and availability impacts and changed scope.
A critical vulnerability in the Security component of Oracle Essbase 21.8.3.0.0 allows a low-privileged attacker with HTTP network access to take over Essbase without user interaction. Successful exploitation can severely impact confidentiality, integrity, and availability, and may significantly affect additional, unspecified products through a scope change. The reported CVSS v3.1 base score is 9.9, with vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. The record was received on October 20, 2026.
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Cross-references every affected SKU, including bundled OEM variants.
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