CVE-2026-4638

PRTG Network Monitor before version 26.2.120.1449 ships a demo EXE/Script sensor that multiplies two integer parameters using cscript.exe. If a non-numeric value is passed instead, cscript.exe raises a 'Type mismatch' runtime error that includes the offending parameter value in plaintext. PRTG provides a documented placeholder variable, %windowspassword, which resolves to the configured Windows/domain password used by PRTG and can be passed as a sensor parameter.  Any PRTG user who is not restricted to read-only access and is permitted to create sensors (the default for non-read-only users) can pass %windowspassword as an argument to the demo VBScript sensor, triggering the type-mismatch error and causing PRTG to display the plaintext password in the sensor's error output.

• CWE-209

• https://paessler.freshdesk.com/en/support/solutions/articles/76000088640
• https://r.sec-consult.com/paessler
• https://www.paessler.com/de/download/
• https://www.paessler.com/prtg/prtg-network-monitor

Published

Sep 24, 2026

Last Modified

Sep 24, 2026

Status

Deferred

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