CVE-2026-28198
Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell
- State
- Published
- Severity
- 9.4 Critical
- Published
- Sep 18, 2026
- Updated
- Sep 18, 2026
- Reserved
- Feb 25, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | ENISA |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | ENISA |
Weaknesses
- CWE-347 Improper verification of cryptographic signature
Affected Products
| Product | Versions |
|---|---|
NetBackup Flex OSCohesity |
|
References
- https://www.cvcn.gov.it/cvcn/cve/CVE-2026-28198government-resource
- https://github.com/cohesity/SecAdvisory/blob/master/COH-2026-0001.mdvendor-advisory
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