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CVE-2026-31981

5.9 · MEDIUM

A Stored HTML Injection vulnerability was discovered in the Diagram tab and Graph view due to a shared input validation function being insufficiently restrictive.

Published Jul 9, 2026nozominetworksCWE-79EPSS 0.25%

Overview

CVE-2026-31981 is a medium-severity vulnerability affecting nozominetworks cmc. It was published on July 9, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from nozominetworks. Update cmc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
nozominetworkscmc>= 0, < 26.2.0Affected
nozominetworksguardian>= 0, < 26.2.0Affected

References

Refsecurity.nozominetworks.com/NN-2026:8-01Refcert-portal.siemens.com/productcert/html/ssa-827968.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31981?

CVE-2026-31981 is a medium-severity vulnerability affecting nozominetworks cmc. It was published on July 9, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-31981?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31981?

Check the references section for vendor advisories and patches from nozominetworks. Update cmc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31981?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31981 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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