CVE-2026-28198: CWE-347 Improper verification of cryptographic signature in Cohesity NetBackup Flex OS
CVE-2026-28198 is a critical vulnerability in Cohesity NetBackup Flex OS that allows an authenticated, low-privileged user with access to the management shell to bypass cryptographic signature verification of a privileged support command. Exploiting this flaw grants the attacker unrestricted root shell access, compromising the entire appliance host and all hosted containers. This results in full control over confidentiality, integrity, and availability of the system.
AI Analysis
Technical Summary
This vulnerability involves improper verification of cryptographic signatures (CWE-347) in NetBackup Flex OS. An attacker with low privileges and access to the management shell can supply a specially crafted access credential to bypass signature verification on a privileged support command. Successful exploitation leads to an unrestricted root shell, allowing complete control over the Flex appliance host and all containers it hosts.
Potential Impact
Successful exploitation grants an attacker full root access to the Flex appliance host and all hosted containers, resulting in total compromise of confidentiality, integrity, and availability of the system.
Mitigation Recommendations
No patch or remediation information is provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
CVE-2026-28198: CWE-347 Improper verification of cryptographic signature in Cohesity NetBackup Flex OS
Description
CVE-2026-28198 is a critical vulnerability in Cohesity NetBackup Flex OS that allows an authenticated, low-privileged user with access to the management shell to bypass cryptographic signature verification of a privileged support command. Exploiting this flaw grants the attacker unrestricted root shell access, compromising the entire appliance host and all hosted containers. This results in full control over confidentiality, integrity, and availability of the system.
CVSS v4.0
Score 9.4critical
Affected software
Cohesity
NetBackup Flex OS
pkg:github/cohesity/NetBackup-Flex-OSRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper verification of cryptographic signatures (CWE-347) in NetBackup Flex OS. An attacker with low privileges and access to the management shell can supply a specially crafted access credential to bypass signature verification on a privileged support command. Successful exploitation leads to an unrestricted root shell, allowing complete control over the Flex appliance host and all containers it hosts.
Potential Impact
Successful exploitation grants an attacker full root access to the Flex appliance host and all hosted containers, resulting in total compromise of confidentiality, integrity, and availability of the system.
Mitigation Recommendations
No patch or remediation information is provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ENISA
- Date Reserved
- 2026-02-25T14:02:29.493Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aadb77255bf5e2cf59e6421
Added to database: 09/18/2026, 22:13:06 UTC
Last enriched: 09/18/2026, 22:15:48 UTC
Last updated: 09/19/2026, 02:14:08 UTC
Views: 6
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