Shell Command Injection in SINEC INS File Upload API

A vulnerability has been identified in SINEC INS (All versions < V1.0 SP2 Update 6). The application does not properly sanitize user input in the /api/sftp/uploadFiles endpoint, allowing the injection of shell command payloads via crafted directory names. These payloads are stored and executed when directory listings are retrieved. This could allow an authenticated remote attacker to execute arbitrary commands on the underlying operating system with the privileges of the affected service user (sinecins).

Casky was already ahead

This CVE exploits attack patterns that Casky's 419matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-46746 is a critical command injection vulnerability in Siemens SINEC INS affecting all versions before V1.0 SP2 Update 6. The flaw exists in the /api/sftp/uploadFiles endpoint, where insufficient input sanitization allows authenticated attackers to embed shell commands within directory names. These malicious payloads persist in the application and execute with the privileges of the service user whenever directory listings are retrieved, creating a stored code injection attack. Organizations running SINEC INS in industrial control environments face significant risk, as successful exploitation enables remote command execution and potential compromise of critical infrastructure systems.

Casky's 419 mapped skills detect this attack pattern by correlating activity across MITRE ATT&CK Initial Access (TA0001), Execution (TA0002), and Persistence (TA0043) techniques. Practitioners leveraging Claude's extended reasoning will identify suspicious indicators including: abnormal API calls to /api/sftp/uploadFiles with special characters or command syntax in directory parameters (Initial Access); spawned child processes or shell execution events coinciding with directory listing operations (Execution); and malicious directory objects retained in the file system that trigger repeated code execution (Persistence). The skill framework enables detection of the complete attack lifecycle—from the initial crafted upload through stored payload activation—rather than isolated events, allowing teams to rapidly contain compromised SINEC INS instances before lateral movement occurs.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

419 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-46746.

analyzing-android-malware-with-apktool

malware analysis · medium

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analyzing-apt-group-with-mitre-navigator

threat intelligence · low

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analyzing-bootkit-and-rootkit-samples

malware analysis · medium

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MITRE ATT&CK Techniques

TA0001 TA0043 TA0002

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