CVE-2026-18265: Osnexus Quantastor

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Osnexus Quantastor: version 6.7.3.010+9c965a6414 only

Published 2026-08-20. Last modified 2026-09-01.