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CVE-2026-31981HTML 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 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.

4.8 MEDIUMEPSS 0.25%Not in KEVNVD: Modified

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
4.8MEDIUM4.0Nozomi (CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
5.9MEDIUM3.1Nozomi (CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
4.8MEDIUM3.1NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Details

CVE ID
CVE-2026-31981
Status
Modified
Assigner (CNA)
Nozomi
Published
Jul 9, 2026
Last modified
2026-08-11 13:18 UTC
Weaknesses
  • CWE-79 · Improper neutralization of input during web page generation ('cross-site scripting')

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 07:26 UTC.