What’s Vulnerable › Vulnerabilities

CVE-2025-40893: HTML injection in Asset List in Guardian/CMC before 25.5.0

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-18 · updated 2026-06-17
• Weakness: CWE-79

Description

A Stored HTML Injection vulnerability was discovered in the Asset List functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets to inject HTML tags into asset attributes. When a victim views the affected assets in the Asset List (and similar functions), the injected HTML renders in their browser, enabling phishing and possibly open redirect attacks. Full XSS exploitation and direct information disclosure are prevented by the existing input validation and Content Security Policy configuration.

Affected products

• Nozomi Networks CMC: before 25.5.0 — fixed in 25.5.0
• Nozomi Networks Guardian: before 25.5.0 — fixed in 25.5.0

How to fix

Upgrade to a fixed version: Nozomi Networks CMC 25.5.0; Nozomi Networks Guardian 25.5.0. Check the vendor advisory for mitigations.

References

• https://security.nozominetworks.com/NN-2025:14-01
• https://cert-portal.siemens.com/productcert/html/ssa-827968.html

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