CVE-2026-31981
mediumpriority · track · 19EPSS 0.003 · 16 %ileDEEUUSEPSS · scored 2026-10-22
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.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedCMCnozomi_psirt
Upgrade to v26.2.0 or later.
- FixedGuardiannozomi_psirt
Upgrade to v26.2.0 or later.
- FixedRUGGEDCOM APE1808siemens_psirt
Upgrade Nozomi Guardian to v26.2.0. Contact customer support to receive patch and update information
- MitigationCMCnozomi_psirt
Use internal firewall features to limit access to the web management interface. Review all accounts with administrative access to it and delete unnecessary ones.
- MitigationGuardiannozomi_psirt
Use internal firewall features to limit access to the web management interface. Review all accounts with administrative access to it and delete unnecessary ones.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.1–5.9
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (10)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- NN-2026:8-01HTML injection in Diagram tab and Graph view in Guardian/CMC before 26.2.02026-07-07csaf · nozomi_psirtUS
- SSA-827968SSA-827968: Vulnerability in Nozomi Guardian/CMC Before V26.2.0 on RUGGEDCOM APE1808 Devices2026-01-13csaf · siemens_psirtDE
Nozomi Networks has published information on vulnerabilities in Nozomi Guardian/CMC. This advisory lists the related Siemens Industrial products affected by these vulnerabilities. Siemens has released a new version for RUGGEDCOM APE1808 and recommends to update to the latest version.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (4)
External citations — patches, advisories, analysis.
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