---
id: "CVE-2018-19410"
kind: "vulnerability"
aliases: ["CVE-2018-19410"]
title: "paessler prtg network monitor: PRTG Network Monitor before 18.2.40.1683 allows remote unauthenticated attackers to create users with read-write\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "paessler prtg network monitor", "fixed": ["18.2.40.1683"], "affected": "< 18.2.40.1683", "ecosystem": "vendor"}, {"name": "Paessler PRTG Network Monitor", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "prtg", "self-hosted", "windows"]
not_affected_if: ["unknown"]
published_at: "2018-11-21T16:29:00+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-24T00:09:50+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-19410", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-19410", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# paessler prtg network monitor: PRTG Network Monitor before 18.2.40.1683 allows remote unauthenticated attackers to create users with read-write…

Paessler PRTG Network Monitor has a local file inclusion flaw that lets a remote attacker with no account create users with read-write or administrator rights. Listed in CISA's Known Exploited Vulnerabilities catalog, so attacks are happening in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:paessler prtg network monitor affected < 18.2.40.1683 fixed 18.2.40.1683
- vendor:Paessler PRTG Network Monitor affected ? fixed ?

## Fix

Apply the mitigations per the vendor's instructions, or discontinue use of the product if mitigations are unavailable (per CISA required action).

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-19410
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2018-19410

## From the sources

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).

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_