# CVE-2026-91527: Oracle ZFS Storage Appliance Kit privilege escalation in Core

Source: https://junglewise.ai/threats/cve-2026-91527-vulnerability-in-the-oracle-zfs-storage-appliance-kit-product-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-91527 · Severity: high · CVSS 8.8 · Published 2026-10-20

The Oracle ZFS Storage Appliance Kit is a network-attached storage system used for data management. A vulnerability in its Core component allows a low-privileged user with network access to gain complete control of the appliance, potentially exposing or destroying all stored data.

Technologies: [Oracle Zfs Storage Appliance Kit](https://junglewise.ai/threats/technologies/zfs-storage-appliance-kit). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-91527 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91527 being exploited in the wild.

**How severe is CVE-2026-91527?** High severity, with a CVSS score of 8.8, published 20 October 2026.

**Which products and versions are affected?** Oracle Zfs Storage Appliance Kit 8.8.

**Is there a fix for CVE-2026-91527?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-91527 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-91527?** Check whether you run Oracle Zfs Storage Appliance Kit at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An easily exploitable vulnerability in the Core component of Oracle ZFS Storage Appliance Kit allows a low-privileged attacker with network access via HTTP to achieve full system compromise. The vulnerability requires authentication but grants complete control over the appliance including confidentiality, integrity, and availability impacts. A fix is expected from Oracle.

## Affected products

- Oracle ZFS Storage Appliance Kit 8.8

## Timeline

- 2026-10-20: disclosed

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

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