CVE-2026-28198
Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
An authenticated, low-privileged user with access to the NetBackup Flex OS management shell could bypass the cryptographic signature verification step of a privileged support command by supplying a specially formed access credential. Successful exploitation grants the attacker an unrestricted root shell with full control over the Flex appliance host and all hosted containers, completely compromising confidentiality, integrity, and availability.
| CWE | CWE-347 |
| Vendor | cohesity |
| Product | netbackup flex os |
| Published | Sep 18, 2026 |
Stay Ahead of the Next One
Get instant alerts for cohesity netbackup flex os
Be the first to know when new high vulnerabilities affecting cohesity netbackup flex os are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Cohesity / NetBackup Flex OS
0 < 6.4