TI-2026-24523 Aliases CVE-2026-31981 GHSA-5g4m-c643-h8fj

HTML injection in Diagram tab and Graph view in Guardian/CMC before 26.2.0

LOW 22CWE-79Published 2026-07-09 · Updated 2026-08-11

Key facts

Attack vector: Network
Privileges required: High
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00251 16th percentileScored 2026-11-07

Fix Fixed Guardian (Nozomi Networks): 26.2.0CMC (Nozomi Networks): 26.2.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Nozomi Networks	Guardian	before 26.2.0	26.2.0	Patch available	CNA
Nozomi Networks	CMC	before 26.2.0	26.2.0	Patch available	CNA

Guardian VendorNozomi Networks Affected before 26.2.0 Fixed in 26.2.0 Patch available CNA
CMC VendorNozomi Networks Affected before 26.2.0 Fixed in 26.2.0 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:nozominetworks:cmc::::::::	before 26.2.0	Vulnerable	Nozomi Networks
cpe:2.3:a:nozominetworks:guardian::::::::	before 26.2.0	Vulnerable	Nozomi Networks

cpe:2.3:a:nozominetworks:cmc:*:*:*:*:*:*:*:* Versions before 26.2.0 Vulnerable ·Nozomi Networks
cpe:2.3:a:nozominetworks:guardian:*:*:*:*:*:*:*:* Versions before 26.2.0 Vulnerable ·Nozomi Networks

Remediation

Fix · CNA Guardian (Nozomi Networks) Fixed in 26.2.0
Fix · CNA CMC (Nozomi Networks) Fixed in 26.2.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-07-09
Nozomi Networks CMC, Guardian 26.2.0
5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2026-24526 DoS through oversized audit log entries in Guardian/CMC before 26.2.0Priority MEDIUM 44
- TI-2026-25787 Incorrect privilege assignment for Arc sensors in Guardian/CMC before 26.2.0Priority LOW 34
- TI-2026-24525 Missing authentication in SSH keys synchronization endpoint in Guardian/CMC before 26.2.0Priority LOW 31
Show all 5 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-31981
2026-10-03 Alias added: GHSA-5g4m-c643-h8fj

References

Advisory 1

https://security.nozominetworks.com/NN-2026:8-01

TI-2022-00470 Authenticated RCE on project configuration import in Guardian/CMC before 22.0.0 CVSS 4.0HIGH 8.6
TI-2026-24526 DoS through oversized audit log entries in Guardian/CMC before 26.2.0 CVSS 4.0HIGH 8.7
TI-2023-15926 DoS on IDS parsing of malformed asset fields in Guardian/CMC >= 22.6.0 before 22.6.3 and 23.1.0 CVSS 4.0HIGH 8.2
TI-2023-13657 SQL Injection on IDS parsing of malformed asset fields in Guardian/CMC >= 22.6.0 before 22.6.3 and 23.1.0 CVSS 4.0CRITICAL 9.2
TI-2023-09405 Authenticated Blind SQL Injection on alerts count in Guardian/CMC before 22.6.2 CVSS 4.0HIGH 8.7
TI-2023-02399 Authenticated SQL Injection on Query functionality in Guardian/CMC before 22.6.3 and 23.1.0 CVSS 4.0HIGH 8.7

See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences