Privilege Escalation via Argument Injection in NetBackup Flex OS Shell
Summary
| CVE | CVE-2026-28197 |
|---|---|
| State | PUBLISHED |
| Assigner | ENISA |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-18 12:17:24 UTC |
| Updated | 2026-09-18 19:24:36 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 9.4 CRITICAL from a6d3dc9e-0591-4a13-bce7-0f5b31ff6158
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.003700000 probability, percentile 0.307920000 (date 2026-09-21)
Problem Types: CWE-88 | CWE-88 CWE-88 Improper neutralization of argument delimiters in a command ('argument injection')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 | Secondary | 9.4 | CRITICAL | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/C... |
| 4.0 | CNA | CVSS | 9.4 | CRITICAL | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
| 3.1 | a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 | Secondary | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 8.8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cohesity | NetBackup Flex OS | affected 6.4 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/cohesity/SecAdvisory/blob/master/COH-2026-0001.md | a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 | github.com | |
| www.cvcn.gov.it/cvcn/cve/CVE-2026-28197 | a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 | www.cvcn.gov.it | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
Workarounds
CNA: Restrict management shell access to authorized administrators only. No compensating control fully eliminates the risk; upgrading is required.