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VERIFIEDConfidence: HIGH
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CVE platform reports and Siemens advisory references confirm three critical CVSS 9.6 flaws (CVE-2026-63350/63353/63354) in SIMATIC Drive Controller CPU 1504D TF from trace file handling.

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Home/Tech/Siemens discloses three critical flaws in SIMATIC Drive Controller
VERIFIEDBy Xavier Rivera· ·1 min read

Siemens discloses three critical flaws in SIMATIC Drive Controller

Three critical vulnerabilities have been reported by Siemens in the SIMATIC Drive Controller CPU 1504D TF. Each received a 9.6 rating from the vendor. The problems enable execution of JavaScript in a browser after tricking a user into importing a malicious trace file, potentially leading to PLC operations.

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Siemens discloses three critical flaws in SIMATIC Drive Controller
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Siemens has disclosed three critical vulnerabilities affecting the SIMATIC Drive Controller CPU 1504D TF.

Three CVEs carry CVSS scores of 9.6. The issues are identified as CVE-2026-63350, CVE-2026-63353, and CVE-2026-63354. Siemens assigns a score of 9.6 to each, while the CNA assigns 9.4.
An attacker needs to deceive a user with the “Read diagnostics” right into loading a malicious trace file.

All three issues stem from trace file handling. The products do not adequately limit runnable content within imported trace files. They also do not clean comment fields or visual marker information from imported CSV trace files prior to display on the Trace page.
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Exploitation requires social engineering. An attacker needs to deceive a user with the “Read diagnostics” right into loading a malicious trace file. Once successful, the attacker can run JavaScript they control inside the browser and carry out PLC actions via the web server, limited to the user's permissions.
Once successful, the attacker can run JavaScript they control inside the browser and carry out PLC actions via the web server, limited to the user's permissions.
Scoring parameters match for all three. The NVD rates the severity of each as CRITICAL.
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Reference advisory is available from Siemens. The full details appear in Siemens security advisory SSA-591731 at the company’s cert portal.
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