Phishing via stored node-label HTML injection
Published Mar 4, 2026 · Updated Mar 4, 2026
Stored HTML injection in Nozomi Networks Guardian and CMC before 25.6.0 allows remote authenticated users to inject tags into node labels. The Alerted Nodes Dashboard insufficiently validates a saved node label and later renders its HTML when the affected node reports an alert. Exploitation requires label-editing privileges, an enabled dashboard, an alert for that node, and victim interaction; existing validation and CSP prevent full XSS and direct disclosure.
Summary
What happened
Stored HTML injection in Nozomi Networks Guardian and CMC before 25.6.0 allows remote authenticated users to inject tags into node labels. The Alerted Nodes Dashboard insufficiently validates a saved node label and later renders its HTML when the affected node reports an alert. Exploitation requires label-editing privileges, an enabled dashboard, an alert for that node, and victim interaction; existing validation and CSP prevent full XSS and direct disclosure.
The record
- CVE
- CVE-2025-40894
- Published
- Mar 4, 2026
- Updated
- Mar 4, 2026
- Vendor
- Nozomi Networks
- Product
- Guardian
- Classifications
- CWE-79, T1204.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 4, 2026CVE publishedPublication date reported by the CVE source.
- Mar 4, 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 <25.6.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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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