CVE-2025-40892: Stored Cross-Site Scripting (XSS) in Reports in Guardian/CMC before 25.5.0

Severity: high (CVSS 8.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% 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 Cross-Site Scripting vulnerability was discovered in the Reports functionality due to improper validation of an input parameter. An authenticated user with report privileges can define a malicious report containing a JavaScript payload, or a victim can be socially engineered to import a malicious report template. When the victim views or imports the report, the XSS executes in their browser context, allowing the attacker to perform unauthorized actions as the victim, such as modify application data, disrupt application availability, and access limited sensitive information.

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

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