---
cve: "CVE-2026-4638"
severity: "HIGH"
cvss: 7.1
epss: ""
vendor: "Paessler GmbH"
kev: false
exploited: false
published: "2026-09-24 10:57:54"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-29T07:37:31+02:00"
---

# CVE-2026-4638

> 7.1 HIGH

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## BSI-Hinweise (deutsch)

- [Paessler PRTG: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3565) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen in Paessler PRTG ausnutzen, um Cross-Site-Scripting-Angriffe durchzuführen, Sicherheitsmaßnahmen zu umgehen und vertrauliche Informationen offenzulegen.

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-4638) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_