CVE-2026-28198 NetBackup Flex OS - Authentication Bypass

NetBackup Flex OS contains a broken authentication vulnerability caused by bypassing cryptographic signature verification in privileged support commands, letting authenticated low-privileged users gain unrestricted root shell access, exploit requires authenticated low-privileged user access to management shell.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Remote Code Execution, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
18 September 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Update to the latest version with the cryptographic signature verification fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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