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CVE-2025-40891— HTML injection in in Time Machine functionality in Guardian/CMC before 25.5.0

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.

Nozomi Networks Guardian是美国Nozomi Networks公司的一款防护软件。 Nozomi Networks Guardian存在跨站脚本漏洞，该漏洞源于网络流量数据验证不当，可能导致HTML注入攻击。

CVSS 4.7 · Medium EPSS 0.18% · P6

Affected Version Matrix 2

VendorProduct Version RangeStatus
Nozomi Networks CMC < 25.5.0 affected
Nozomi Networks Guardian < 25.5.0 affected
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I. Basic Information for CVE-2025-40891

Vulnerability Information
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Vulnerability Title
HTML injection in in Time Machine functionality in Guardian/CMC before 25.5.0
Source: CVE Program / CVE List V5
Vulnerability Description
A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets at two different times to inject HTML tags into asset attributes across two snapshots. Exploitation requires a victim to use the Time Machine Snapshot Diff feature on those specific snapshots and perform specific GUI actions, at which point the injected HTML renders in their browser, enabling phishing and open redirect attacks. Full XSS exploitation is prevented by input validation and Content Security Policy. Attack complexity is high due to multiple required conditions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Nozomi Networks Guardian 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nozomi Networks Guardian是美国Nozomi Networks公司的一款防护软件。 Nozomi Networks Guardian存在跨站脚本漏洞，该漏洞源于网络流量数据验证不当，可能导致HTML注入攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Nozomi Networks Guardian 0 ~ 25.5.0 -
Nozomi Networks CMC 0 ~ 25.5.0 -

II. Public POCs for CVE-2025-40891

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III. Intelligence Information for CVE-2025-40891

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Other References for CVE-2025-40891 (1)

Same Patch Batch · Nozomi Networks · 2025-12-18 · 4 CVEs total

CVE-2025-40892 8.9 HIGH Stored Cross-Site Scripting (XSS) in Reports in Guardian/CMC before 25.5.0
CVE-2025-40898 8.1 HIGH Path traversal in Import Arc data archive functionality in Guardian/CMC before 25.5.0
CVE-2025-40893 6.1 MEDIUM HTML injection in Asset List in Guardian/CMC before 25.5.0

IV. Related Vulnerabilities

Same product: Guardian
Same vendor: Nozomi Networks
Same weakness: CWE-79

V. Comments for CVE-2025-40891

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