CVE-2026-4638 Details
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.
A vulnerability allowing information disclosure has been identified in PRTG Network Monitor versions prior to 26.2.120.1449. The issue arises in a demo EXE/Script sensor that uses cscript.exe to multiply two integer parameters. If a non-numeric value is provided, cscript.exe generates a 'Type mismatch' runtime error that includes the erroneous parameter value in plaintext. PRTG includes a documented placeholder variable, %windowspassword, which resolves to the user's Windows/domain password. Users with permission to create sensors can exploit this vulnerability by passing %windowspassword as an argument to the demo VBScript sensor, causing the plaintext password to be displayed in the sensor's error output.
Users are advised to upgrade to PRTG version 26.2.120.1449, which addresses this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 24, 2026CISA-ADP
Assessed Sep 24, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://paessler.freshdesk.com/en/support/solutions/articles/76000088640 | SEC Consult Vulnerability Lab | AdvisoryBundleRemedyVendor |
| https://r.sec-consult.com/paessler | SEC Consult Vulnerability Lab | BundleExploitRemedyTechnical Analysis |
| https://www.paessler.com/de/download/ | SEC Consult Vulnerability Lab | ProductVendor |
| https://www.paessler.com/prtg/prtg-network-monitor | SEC Consult Vulnerability Lab | ProductVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-209 | Generation of Error Message Containing Sensitive Information | SEC Consult Vulnerability Lab |
Affected Products
| Product | Versions |
|---|---|
| Paessler PRTG Network Monitor | < 26.2.120.1449 |
CPE
Remediation
| |
| Paessler PRTG Enterprise Monitor | < 26.2.120.1449 |
CPE
Remediation
| |
| Paessler PRTG Hosted Monitor | All versions |
CPE
Remediation
| |
| Paessler PRTG UVexplorer | < 26.2.120.1449 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 24, 2026 | CVE Modified | CISA-ADP |
| Sep 24, 2026 | New CVE Received | SEC Consult Vulnerability Lab |