CVE-2026-28197

High

Description

An authenticated, low-privileged user with access to the NetBackup Flex OS management shell could supply a specially crafted input to a privileged administrative command, causing it to execute arbitrary code with root-level permissions. Successful exploitation grants the attacker unrestricted control over the Flex appliance host and all hosted containers, fully compromising confidentiality, integrity, and availability.

SeverityHigh

CVSS8.8

Exploit probability—

ProductNetBackup Flex OS

PublishedSep 18, 2026

First seenSep 18, 2026

Weakness typeCWE-88CWE-88

How to fix

Update

Cohesity NetBackup Flex OS6.4 or later

Vendor advisories

github.com/cohesity/SecAdvisory/blob/master/COH-2026-0001.md

Affected products

Product	Affected versions	Fixed in
Cohesity NetBackup Flex OS	v < 6.4	6.4

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