Stored HTML injection via restore schedule
Published May 19, 2026 · Updated May 19, 2026
Stored HTML injection in Schedule Restore Archive in Nozomi Networks Guardian and CMC before 26.1.0 allows remote authenticated users to inject HTML. The schedule-creation path accepts HTML tags in an input parameter and stores them without sufficient validation for rendering when the affected schedule is viewed. Administrative access is required to define the malicious schedule, and a victim must view it; existing validation and CSP prevent full XSS and direct disclosure, limiting impact to phishing and possible open redirects.
Summary
What happened
Stored HTML injection in Schedule Restore Archive in Nozomi Networks Guardian and CMC before 26.1.0 allows remote authenticated users to inject HTML. The schedule-creation path accepts HTML tags in an input parameter and stores them without sufficient validation for rendering when the affected schedule is viewed. Administrative access is required to define the malicious schedule, and a victim must view it; existing validation and CSP prevent full XSS and direct disclosure, limiting impact to phishing and possible open redirects.
The record
- CVE
- CVE-2025-40903
- Published
- May 19, 2026
- Updated
- May 19, 2026
- Vendor
- Nozomi Networks
- Product
- Guardian
- Classifications
- CWE-79
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- May 19, 2026CVE publishedPublication date reported by the CVE source.
- May 19, 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 <26.1.0
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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