{"id":"CVE-2026-28198","title":"An authenticated, low-privileged user with access to the NetBackup Flex \nOS management shell could bypass the cryptographic signature \nverification step of a privileged support command by supplying a \nspecially formed access credential","summary":"An authenticated, low-privileged user with access to the NetBackup Flex \nOS management shell could bypass the cryptographic signature \nverification step of a privileged support command by supplying a \nspecially formed access credential. …","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-347"],"vendor":"Cohesity","product":"NetBackup Flex OS","affected":["netbackup_flex_os < 6.4"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:24:36.593","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-28198","references":[{"url":"https://github.com/cohesity/SecAdvisory/blob/master/COH-2026-0001.md","label":"a6d3dc9e-0591-4a13-bce7-0f5b31ff6158"},{"url":"https://www.cvcn.gov.it/cvcn/cve/CVE-2026-28198","label":"a6d3dc9e-0591-4a13-bce7-0f5b31ff6158"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-18T14:14:16.330258Z"},"ingestedAt":"2026-09-18T11:40:03.684Z","epss":0.00199,"epssPercentile":0.09984,"slug":"CVE-2026-28198","body":"## Overview\n\nAn authenticated, low-privileged user with access to the NetBackup Flex \nOS management shell could bypass the cryptographic signature \nverification step of a privileged support command by supplying a \nspecially formed access credential. Successful exploitation grants the \nattacker an unrestricted root shell with full control over the Flex \nappliance host and all hosted containers, completely compromising \nconfidentiality, integrity, and availability.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}