Phishing via permissive N2OS HTML validation
Published Jul 9, 2026 · Updated Jul 9, 2026
Stored HTML injection in Nozomi Networks Guardian and CMC before 26.2.0 allows remote authenticated users to render malicious HTML. The shared N2OS input-validation function accepts HTML tags through multiple configuration-data inputs, which the Diagram tab and Graph view later render in a victim's browser. Administrative privileges and victim interaction are required; the result is limited to phishing and redirection attempts because validation and CSP prevent script execution and direct data disclosure.
Summary
What happened
Stored HTML injection in Nozomi Networks Guardian and CMC before 26.2.0 allows remote authenticated users to render malicious HTML. The shared N2OS input-validation function accepts HTML tags through multiple configuration-data inputs, which the Diagram tab and Graph view later render in a victim's browser. Administrative privileges and victim interaction are required; the result is limited to phishing and redirection attempts because validation and CSP prevent script execution and direct data disclosure.
The record
- CVE
- CVE-2026-31981
- Published
- Jul 9, 2026
- Updated
- Jul 9, 2026
- Vendor
- Nozomi Networks
- Product
- Guardian
- Classifications
- CWE-79, T1566.002
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jul 9, 2026CVE publishedPublication date reported by the CVE source.
- Jul 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <26.2.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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