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CVE-2026-28198— Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell

Quick assessment

Affected
Cohesity NetBackup Flex OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

拥有 NetBackup Flex OS 管理 Shell 访问权限的已认证低权限用户，可以通过提供一个特制的访问凭证，绕过特权支持命令的加密签名验证步骤。成功利用该漏洞将使攻击者获得无限制的特权根 Shell（root shell），从而完全控制 Flex 设备主机及其所有托管容器，并彻底破坏其机密性、完整性和可用性。

CVSS 8.8 · High EPSS 0.20% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
Cohesity NetBackup Flex OS < 6.4 affected
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I. Basic Information for CVE-2026-28198

Vulnerability Information
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Vulnerability Title
Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cohesity NetBackup Flex OS 0 ~ 6.4 -

II. Public POCs for CVE-2026-28198

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III. Intelligence Information for CVE-2026-28198

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Other References for CVE-2026-28198 (2)

Same Patch Batch · Cohesity · 2026-09-18 · 3 CVEs total

CVE-2026-28197 8.8 HIGH Privilege Escalation via Argument Injection in NetBackup Flex OS Shell
CVE-2026-28199 3.3 LOW Sensitive File Disclosure via Relative Path Traversal in NetBackup Flex OS Shell

IV. Related Vulnerabilities

Same product: NetBackup Flex OS
Same vendor: Cohesity
Same weakness: CWE-347

V. Comments for CVE-2026-28198

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