Stored XSS in Reports Allows Data Manipulation and Disclosure

Executive Summary

CVE-2025-40892 is a Stored Cross-Site Scripting (XSS) vulnerability in the Reports functionality of Nozomi Networks Guardian and CMC products. It occurs because of improper validation of an input parameter. An authenticated user with report privileges can create a malicious report containing JavaScript code, or a victim can be tricked into importing a malicious report template. When the victim views or imports this report, the malicious script runs in their browser, allowing the attacker to perform unauthorized actions. [1]

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Impact Analysis

This vulnerability can allow an attacker to execute unauthorized actions as the victim, such as modifying application data, disrupting application availability, and accessing sensitive information that should be limited. This can lead to data integrity issues, service disruption, and potential data breaches. [1]

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Detection Guidance

Detection involves auditing report templates for malicious JavaScript payloads and monitoring user activities related to report creation or import. Since the vulnerability is a Stored Cross-Site Scripting in report templates, you can search for suspicious script tags or JavaScript code within report definitions. Commands to search for suspicious content might include using grep or similar tools on report template files or database entries, for example: grep -i '<script' /path/to/report/templates or querying the database for suspicious patterns. Additionally, monitoring web management interface access logs for unusual activity by users with report privileges can help detect exploitation attempts. [1]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the web management interface using internal firewall rules, auditing and removing unnecessary user accounts with report privileges, and reviewing existing report templates to identify and remove any malicious or suspicious content. The definitive solution is to upgrade the affected products (Guardian and CMC) to version 25.5.0 or later. [1]

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Compliance Impact

The provided resources do not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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