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From The CircuitryVerified tech news, cross-checked.How we verify →
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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. Corrected Oct 13 (quality watch 8:19 AM AST) against NVD records CVE-2026-63350/63353/63354 (source productcert@siemens.com, status Received, CVSS 3.1 9.6 primary + CVSS 4.0 9.4 secondary, both Siemens; CWE-95/79/79; ~157 affected product entries incl. S7-1500, ET 200SP, Drive Controller 1504D/1507D TF, Software Controllers, PLCSIM Advanced, SIPLUS; ref SSA-591731). An earlier version said the flaws affect the SIMATIC Drive Controller CPU 1504D TF, that the CNA scored them 9.4 separately from Siemens, and that NVD rated them critical. The CVE records list dozens of SIMATIC products, including the S7-1500 CPU family. Siemens, which filed the records as the CVE numbering authority, rates each 9.6 under CVSS 3.1 and 9.4 under CVSS 4.0, and NVD has not published its own scores.

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Home/Security/Siemens discloses three critical trace-file flaws across SIMATIC S7-1500 controllers
VERIFIEDBy Xavier Rivera·Tuesday, October 13, 2026 at 6:23 AM AST·1.5 min read

Siemens discloses three critical trace-file flaws across SIMATIC S7-1500 controllers

Siemens has disclosed three critical flaws, CVE-2026-63350, CVE-2026-63353 and CVE-2026-63354, in how dozens of SIMATIC controllers, including the S7-1500 family, handle imported trace files. Siemens rates each 9.6 (CVSS 3.1). An attacker must trick a user into importing a malicious trace file.

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Siemens discloses three critical trace-file flaws across SIMATIC S7-1500 controllers
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TL;DRAI · 60 sec read

Siemens has disclosed three critical trace-file flaws (CVE-2026-63350, -63353, -63354) affecting dozens of SIMATIC products, including the S7-1500 CPU family, ET 200SP CPUs, Drive Controllers, Software Controllers and S7-PLCSIM Advanced. Siemens rates each 9.6 under CVSS 3.1 and 9.4 under CVSS 4.0; NVD has not scored them. Exploitation needs a user with the Read diagnostics right to import a crafted trace file.

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Story updates1 update
Oct 13, 9:16 AM ET

Correction (Oct 13): An earlier version said the flaws affect the SIMATIC Drive Controller CPU 1504D TF, that the CNA scored them 9.4 separately from Siemens, and that NVD rated them critical. The CVE records list dozens of SIMATIC products, including the S7-1500 CPU family. Siemens, which filed the records as the CVE numbering authority, rates each 9.6 under CVSS 3.1 and 9.4 under CVSS 4.0, and NVD has not published its own scores.

⚐ CORRECTEDTuesday, October 13, 2026 at 9:16 AM EDT

Correction (Oct 13): An earlier version said the flaws affect the SIMATIC Drive Controller CPU 1504D TF, that the CNA scored them 9.4 separately from Siemens, and that NVD rated them critical. The CVE records list dozens of SIMATIC products, including the S7-1500 CPU family. Siemens, which filed the records as the CVE numbering authority, rates each 9.6 under CVSS 3.1 and 9.4 under CVSS 4.0, and NVD has not published its own scores.

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Siemens has disclosed three critical vulnerabilities in the trace feature of the web server on a wide range of SIMATIC controllers, according to the CVE records it filed and Siemens security advisory SSA-591731.

Dozens of products are affected. The records list the SIMATIC S7-1500 CPU family, ET 200SP CPUs and Open Controllers, the SIMATIC Drive Controller CPU 1504D TF and 1507D TF, S7-1500 Software Controllers, S7-PLCSIM Advanced and SIPLUS variants.
An attacker needs to deceive a user with the “Read diagnostics” right into loading a malicious trace file.

Siemens rates all three 9.6 out of 10. CVE-2026-63350, CVE-2026-63353 and CVE-2026-63354 each carry a CVSS 3.1 score of 9.6 and a CVSS 4.0 score of 9.4. Both scores come from Siemens ProductCERT, which filed the records as the CVE numbering authority. NVD has received the records but has not published its own assessment yet.
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All three involve imported trace files. CVE-2026-63350 is a failure to restrict executable content in imported trace files (CWE-95). CVE-2026-63353 and CVE-2026-63354 are cross-site scripting flaws (CWE-79): the devices don't properly sanitize comment fields, or visual marker data in imported CSV trace files, before showing them on the Trace page.
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.
Exploitation requires social engineering. An attacker has to trick a user who holds the “Read diagnostics” function right into importing a specially crafted trace file. If that works, attacker-controlled JavaScript can run in the user's browser session and carry out PLC operations through the web server, within the limits of that user's authorization.

Fixes and mitigations. Siemens lists affected versions, updates and mitigations in advisory SSA-591731.
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Correction (Oct 13): An earlier version said the flaws affect the SIMATIC Drive Controller CPU 1504D TF, that the CNA scored them 9.4 separately from Siemens, and that NVD rated them critical. The CVE records list dozens of SIMATIC products, including the S7-1500 CPU family. Siemens, which filed the records as the CVE numbering authority, rates each 9.6 under CVSS 3.1 and 9.4 under CVSS 4.0, and NVD has not published its own scores.

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