Vulnerability Description
A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets at two different times to inject HTML tags into asset attributes across two snapshots. Exploitation requires a victim to use the Time Machine Snapshot Diff feature on those specific snapshots and perform specific GUI actions, at which point the injected HTML renders in their browser, enabling phishing and open redirect attacks. Full XSS exploitation is prevented by input validation and Content Security Policy. Attack complexity is high due to multiple required conditions.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nozominetworks | Cmc | < 25.5.0 |
| Nozominetworks | Guardian | < 25.5.0 |
Related Weaknesses (CWE)
References
- https://security.nozominetworks.com/NN-2025:12-01Vendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-827968.html
FAQ
What is CVE-2025-40891?
CVE-2025-40891 is a vulnerability with a CVSS score of 4.7 (MEDIUM). A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially ...
How severe is CVE-2025-40891?
CVE-2025-40891 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-40891?
Check the references section above for vendor advisories and patch information. Affected products include: Nozominetworks Cmc, Nozominetworks Guardian.