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CVE-2026-33923— Update bundle signature bypass in Guardian/CMC before 26.4.0

Quick assessment

Affected
Nozomi Networks Guardian
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.

在更新安装功能中发现了一个签名验证漏洞，原因是更新包内容的验证机制不一致。拥有管理员权限的攻击者可以远程提供一个精心构造的更新包，该包虽能通过签名验证，但在安装时会执行未经签名的脚本。该脚本将以 root 权限运行，使攻击者能够读取或修改敏感数据、更改设备配置，或关闭设备。

CVSS 7.2 · High
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I. Basic Information for CVE-2026-33923

Vulnerability Information
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Vulnerability Title
Update bundle signature bypass in Guardian/CMC before 26.4.0
Source: CVE Program / CVE List V5
Vulnerability Description
A signature verification vulnerability was discovered in the update installation functionality due to inconsistent validation of the update bundle contents. An attacker with administrative privileges can remotely supply a crafted update bundle that passes signature verification but runs an unsigned script when the bundle is installed. The script runs with root privileges, allowing the attacker to read or modify sensitive data, change the appliance configuration, or shut down the appliance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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
Nozomi Networks Guardian 0 ~ 26.4.0 -
Nozomi Networks CMC 0 ~ 26.4.0 -

II. Public POCs for CVE-2026-33923

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III. Intelligence Information for CVE-2026-33923

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Vendor Advisories for CVE-2026-33923 (1)

IV. Related Vulnerabilities

Same product: Guardian
Same vendor: Nozomi Networks
Same weakness: CWE-347