CVE-2026-28199 Sensitive File Disclosure via Relative Path Traversal in NetBackup Flex OS Shell
Authenticated users can read arbitrary files via path traversal in the management shell, exposing sensitive system data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-28199?
CVE-2026-28199 is a medium-severity path traversal vulnerability in Cohesity NetBackup Flex OS, published on 18 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An authenticated user with access to the NetBackup Flex OS management shell could read arbitrary files from the underlying operating system by supplying a specially crafted path argument to a diagnostic command. Successful exploitation could expose sensitive system configuration and credential material stored on the appliance.
Weakness: CWE-347
Which versions are affected by CVE-2026-28199?
How do I fix CVE-2026-28199?
No fix has been published for CVE-2026-28199 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-28199 being exploited?
There is no known exploitation of CVE-2026-28199 in the wild and no public exploit code.
Sources
Also known as GHSA-chmq-8gh3-838c.