CVE-2026-28198Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell
Updated under an hour ago ()
Does this affect you?
It affects Cohesity NetBackup Flex OS. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-347
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- ENISA
- NVD analysis
- Deferred
- Record last updated
- Sep 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cohesity NetBackup Flex OS cohesity:netbackup_flex_os (from the name) | before 6.4 | CNA record |
References
- https://www.cvcn.gov.it/cvcn/cve/CVE-2026-28198government-resource
- https://github.com/cohesity/SecAdvisory/blob/master/COH-2026-0001.mdvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.