CVE-2018-19410: Paessler PRTG Network Monitor Local File Inclusion Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2025-02-04. EPSS: 97.9% chance of exploitation in the next 30 days.

PRTG Network Monitor before 18.2.40.1683 allows remote unauthenticated attackers to create users with read-write privileges (including administrator). A remote unauthenticated user can craft an HTTP request and override attributes of the 'include' directive in /public/login.htm and perform a Local File Inclusion attack, by including /api/addusers and executing it. By providing the 'id' and 'users' parameters, an unauthenticated attacker can create a user with read-write privileges (including administrator).

Affected products

• Paessler PRTG Network Monitor: before 18.2.40.1683 (fixed in 18.2.40.1683)

Published 2018-11-21. Last modified 2026-06-17.