Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nozominetworks | Cmc | < 26.2.0 |
| Nozominetworks | Guardian | < 26.2.0 |
Related Weaknesses (CWE)
References
- https://security.nozominetworks.com/NN-2026:8-01MitigationVendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-827968.html
FAQ
What is CVE-2026-31981?
CVE-2026-31981 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 administra...
How severe is CVE-2026-31981?
CVE-2026-31981 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31981?
Check the references section above for vendor advisories and patch information. Affected products include: Nozominetworks Cmc, Nozominetworks Guardian.