CVE-2026-31981
MediumCVSS 5.9Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
A Stored HTML Injection vulnerability was discovered in N2OS in the Diagram tab and Graph view due to insufficient input validation. An authenticated administrator can inject malicious HTML tags into configuration data, which renders in a victim's browser when viewing the affected data. This enables phishing and possible open redirect attacks, though full XSS and direct information disclosure are prevented by existing controls.
Risk Assessment
The organization is at risk of phishing attacks and redirects to malicious sites, potentially leading to credential theft or malware infection. Despite limitations preventing XSS and direct data leaks, the risk to users is significant.
Recommendation
Update N2OS to the latest patched version immediately to strengthen input validation. Until then, restrict administrative access to trusted users and monitor activity in the Diagram tab and Graph view.
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Original NVD description (English source)
A Stored HTML Injection vulnerability was discovered in the Diagram tab and Graph view due to a shared input validation function being insufficiently restrictive. An authenticated user with administrative privileges can inject malicious HTML tags into N2OS configuration data through multiple input vectors. When a victim views the affected data in the Diagram tab and Graph view, 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS