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CVE-2026-91655 is a 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 the vulnerability with low complexity and no user interaction. Successful exploitation can expose critical data or all Essbase-accessible data, permit modification of some accessible data, and cause partial denial of service. Attacks may significantly affect additional products across security boundaries. The vulnerability has a CVSS v3.1 base score of 9.1 with vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L. The underlying weakness and vulnerable function are not specified.
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No public exploit code observed for this vulnerability.
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A vulnerability in the Security component of Oracle Essbase 21.8.3.0.0 allows a low-privileged attacker with HTTP network access to obtain critical or all Essbase-accessible data, modify some accessible data, and cause partial denial of service. Exploitation requires no user interaction and may significantly affect additional, unspecified products through a scope change. The CVSS 3.1 base score is 9.1, with vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L.
A vulnerability in the Security component of Oracle Essbase 21.8.3.0.0 allows a low-privileged attacker to compromise the product over HTTP without user interaction. Successful exploitation can expose all Essbase-accessible data, permit unauthorized modification of some data, and cause a partial denial of service. Attacks may significantly affect additional products because the vulnerability has changed scope. The CVSS v3.1 base score is 9.1, with vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
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