CVE-2026-28197 Privilege Escalation via Argument Injection in NetBackup Flex OS Shell
Authenticated low-privileged users can execute arbitrary code with root permissions via argument injection in the NetBackup Flex OS management shell.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-28197?
CVE-2026-28197 is a critical vulnerability in Cohesity NetBackup Flex OS, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-88
Which versions are affected by CVE-2026-28197?
How do I fix CVE-2026-28197?
No fix has been published for CVE-2026-28197 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-28197 being exploited?
There is no known exploitation of CVE-2026-28197 in the wild and no public exploit code.
Sources
Also known as GHSA-3x2v-v38v-4mgx.