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.
Advisories

No advisories yet.

Fixes

Solution

Upgrade to v26.2.0 or later.


Workaround

Use internal firewall features to limit access to the web management interface.

History

Tue, 11 Aug 2026 16:00:00 +0000

Type Values Removed Values Added
References

Tue, 11 Aug 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 09 Jul 2026 08:15:00 +0000

Type Values Removed Values Added
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.
Title HTML injection in Diagram tab and Graph view in Guardian/CMC before 26.2.0
First Time appeared Nozomi Networks
Nozomi Networks cmc
Nozomi Networks guardian
Weaknesses CWE-79
CPEs cpe:2.3:a:nozomi_networks:cmc:*:*:*:*:*:*:*:*
cpe:2.3:a:nozomi_networks:guardian:*:*:*:*:*:*:*:*
Vendors & Products Nozomi Networks
Nozomi Networks cmc
Nozomi Networks guardian
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L'}

cvssV4_0

{'score': 4.8, 'vector': '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'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: Nozomi

Published:

Updated: 2026-08-11T12:23:39.257Z

Reserved: 2026-03-10T16:14:03.265Z

Link: CVE-2026-31981

cve-icon Vulnrichment

Updated: 2026-08-11T12:23:39.257Z

cve-icon NVD

Status : Modified

Published: 2026-07-09T08:16:47.483

Modified: 2026-08-11T13:18:14.453

Link: CVE-2026-31981

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-01T15:00:06Z

Weaknesses