CVE-2025-40903

Summary

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.

Affected Software

Weaknesses

• CWE-79: CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')

Workarounds

Use internal firewall features to limit access to the web management interface. Review all accounts with administrative access to it and delete unnecessary ones.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://cert-portal.siemens.com/productcert/html/ssa-827968.html

References

• https://security.nozominetworks.com/NN-2026:6-01

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