How severe is CVE-2026-91527?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Oracle Corporation Zfs Storage Appliance Kit

CVE-2026-91527

Vulnerability in the Oracle ZFS Storage Appliance Kit product of Oracle Systems (component: Core). The supported version that is affected is 8.8. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle ZFS Storage Appliance Kit. Successful attacks of this vulnerability can result in takeover of Oracle ZFS Storage Appliance Kit. 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).

Published 2026-10-20 · last modified 2026-10-21.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Oracle Corporation Zfs Storage Appliance Kit — versions 8.8

References

www.oracle.com/security-alerts/cpuoct2026.html (vendor-advisory)

Frequently asked questions

What is CVE-2026-91527?: CVE-2026-91527 is a high-severity vulnerability in Oracle Corporation Zfs Storage Appliance Kit. CVSS score: 8.8/10. Published 2026-10-20.
How severe is CVE-2026-91527?: High severity. CVSS v3 base score is 8.8 out of 10.