CVE-2026-31981 — HTML injection in Diagram tab and Graph view in Guardian/CMC before 26.2.0
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 authenticat…
Published: 2026-07-09 · CVSS: 4.8 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7