What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-02-04
• EPSS: 97.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-11-21 · updated 2026-06-17

Description

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: before 18.2.40.1683 — fixed in 18.2.40.1683

How to fix

Upgrade to a fixed version: Paessler PRTG 18.2.40.1683. Check the vendor advisory for mitigations.

References

• https://www.ptsecurity.com/ww-en/analytics/threatscape/pt-2018-24/
• https://www.ptsecurity.com/ww-en/analytics/threatscape/pt-2018-24/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-19410

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