CVE-2025-40903
HTML injection in Schedule Restore Archive in Guardian/CMC before 26.1.0
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
A Stored HTML Injection vulnerability was discovered in the Schedule Restore Archive functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can define a malicious restore schedule containing HTML tags. When a victim views the affected schedule, 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.
| CWE | CWE-79 |
| Vendor | nozomi networks |
| Product | guardian |
| Published | May 19, 2026 |
| Last Updated | May 19, 2026 |
Stay Ahead of the Next One
Get instant alerts for nozomi networks guardian
Be the first to know when new medium vulnerabilities affecting nozomi networks guardian are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low
Affected Versions
Nozomi Networks / Guardian
0 < 26.1.0
Nozomi Networks / CMC
0 < 26.1.0
References
Credits
This issue was found by Stefano Libero and Andrea Palanca of Nozomi Networks Product Security team during an internal investigation.