Siemens Trace Page input validation

Summaryinfo

A vulnerability was found in Siemens and classified as very critical. The impacted element is an unknown function of the component Trace Page. Such manipulation leads to input validation. This vulnerability is uniquely identified as CVE-2026-63354. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Siemens (the affected version is unknown). Affected by this issue is an unknown code of the component Trace Page. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at cert-portal.siemens.com. This vulnerability is handled as CVE-2026-63354 since 07/16/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/13/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-3891). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Siemens SIMATIC S7

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Name

• Siemens

License

• commercial

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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