CVE-2026-25786 — CRITICAL (9.1)

Vulnerability Description

Affected devices do not properly validate and sanitize PLC/station name rendered on the "communication" parameters page of the web interface. This could allow an authenticated attacker who is authorized to download a TIA project into the product, to inject malicious scripts into the page. If a benign user with appropriate rights accesses the "communication" parameters page, the malicious code would be executed in the scope of their web session.

CVSS Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-79

References

https://cert-portal.siemens.com/productcert/html/ssa-688146.html

FAQ

What is CVE-2026-25786?

CVE-2026-25786 is a vulnerability with a CVSS score of 9.1 (CRITICAL). Affected devices do not properly validate and sanitize PLC/station name rendered on the "communication" parameters page of the web interface. This could allow an authenticated attacker who is authori...

How severe is CVE-2026-25786?

CVE-2026-25786 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-25786?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.