CVE-2026-18265
Received Received - Intake

Remote Code Execution in OSNEXUS QuantaStor

Publication date: 2026-08-20

Last updated on: 2026-08-20

Assigner: Zero Day Initiative

Description
OSNEXUS QuantaStor Missing Authentication Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of OSNEXUS QuantaStor. Authentication is not required to exploit this vulnerability. The specific flaw exists within the configuration of Kapacitor. The issue results from the lack of authentication prior to allowing access to functionality. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-30036.

CVSS Scores

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Meta Information

Published
2026-08-20
Last Modified
2026-08-20
Generated
2026-08-20
AI Q&A
2026-08-20
EPSS Evaluated
N/A
NVD
CVE-2026-18265
EUVD
EUVD-2026-63483

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
osnexus quantastor *
osnexus quantastor 6.8.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Attack-Flow Graph

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Executive Summary

This is a critical vulnerability in OSNEXUS QuantaStor software affecting the Kapacitor configuration. It allows remote attackers to execute arbitrary code without authentication, potentially gaining root-level access. The flaw exists due to missing authentication before accessing certain functionality.

Detection Guidance

To detect this vulnerability, check if your OSNEXUS QuantaStor system is running a version prior to 6.8.0. Verify the Kapacitor service configuration for missing authentication. Network scans can identify exposed Kapacitor ports (default 9092) on affected systems.

Impact Analysis

An attacker could exploit this to run malicious code on your system with root privileges. This could lead to full system compromise, data theft, or disruption of services. The high CVSS score of 9.8 indicates severe potential impact on confidentiality, integrity, and availability.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and access controls. Organizations may face compliance violations, fines, and reputational damage if exploited.

Mitigation Strategies

Immediately upgrade OSNEXUS QuantaStor to version 6.8.0 or later. Ensure Kapacitor is configured with proper authentication. Isolate affected systems from untrusted networks until patched. Monitor for suspicious activity on port 9092.

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