CVE-2026-63354: Siemens SIMATIC Drive Controller CPU 1504d Tf

Critical severity, CVSS 9.6. EPSS: 0.5% chance of exploitation in the next 30 days.

Affected devices do not properly validate and sanitize visual marker data contained in imported CSV trace files before rendering it on the Trace page. This could allow an attacker to social engineer an authorized user who holds the function right “Read diagnostics” into importing a specially crafted trace file. Successful exploitation could allow attacker-controlled JavaScript to execute in the user’s browser session and perform PLC operations through the web server within the scope of the user’s authorization.

Affected products

Published 2026-10-13. Last modified 2026-10-16.