Vulnerability in Cohesity Netbackup Flex OS
CVE-2026-28198
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.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
Weakness classification (CWE)
References
- a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (government-resource)
- a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-28198?
- CVE-2026-28198 is a high-severity vulnerability in Cohesity Netbackup Flex OS, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.8/10. Published 2026-09-18.
- How severe is CVE-2026-28198?
- High severity. CVSS v3 base score is 8.8 out of 10.