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CVE-2026-91658 is a critical vulnerability in the Security component of Oracle Essbase 21.8.3.0.0. A low-privileged attacker with network access over HTTP can exploit the vulnerability with low attack complexity and no user interaction to take over Oracle Essbase. Exploitation may also significantly affect additional products outside the vulnerable component's security scope. The vulnerability has a CVSS 3.1 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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No public exploit code observed for this vulnerability.
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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 severely affect confidentiality, integrity, and availability and may significantly impact additional, unspecified products. The CVSS 3.1 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.
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 the application without user interaction. Successful exploitation can severely affect confidentiality, integrity, and availability, with potential impacts extending to additional products. The reported CVSS v3.1 base score is 9.9 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
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.
Community discussion across Reddit, Mastodon, and other social sources.