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CVE-2026-4638

Plaintext Password Disclosure via VBScript Sensor Error Message in Paessler PRTG Network Monitor

CVSS 4.0 7.1 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-4638

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-4638

Published

PRTG Network Monitor

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Paessler GmbH",
                    "product": "PRTG Network Monitor",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "26.2.120.1449",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON