Vulnerability Description
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.
Related Weaknesses (CWE)
References
- 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
FAQ
What is CVE-2026-4638?
CVE-2026-4638 is a documented vulnerability. 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 ...
How severe is CVE-2026-4638?
CVSS scoring is not yet available for CVE-2026-4638. Check NVD for updates.
Is there a patch for CVE-2026-4638?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.