CVE-2026-31981

Summary

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.

Affected Software

Weaknesses

• CWE-79: CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')

Workarounds

Use internal firewall features to limit access to the web management interface. Review all accounts with administrative access to it and delete unnecessary ones.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://security.nozominetworks.com/NN-2026:8-01

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