Vulnerability · Published Jul 9, 2026 · Assigned by Nozomi
CVE-2026-31981HTML injection in Diagram tab and Graph view in Guardian/CMC before 26.2.0
Medium 5.9
In plain English
A medium-severity cross-site scripting in CMC from Nozomi Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Nozomi Networks | Guardian | 0 – before 26.2.0 |
| Nozomi Networks | CMC | 0 – before 26.2.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L