CVE-2018-19410Known exploitationPublic exploitNetwork attack vector

Unauthenticated administrator creation via login include override

Published Nov 21, 2018 · Updated Oct 21, 2025

Authentication bypass in PRTG Network Monitor before 18.2.40.1683 allows remote attackers to create administrators via HTTP requests. The /public/login.htm include directive accepts attacker-controlled attributes that invoke /api/addusers with supplied id and users parameters. Network access to the login page is sufficient; no existing account or user interaction is required, and the created application account has read-write privileges, including administrator access.

CVSS severity9.8
Critical
EPSS probability97.94%
Next 30 days · Nov 1, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in PRTG Network Monitor before 18.2.40.1683 allows remote attackers to create administrators via HTTP requests. The /public/login.htm include directive accepts attacker-controlled attributes that invoke /api/addusers with supplied id and users parameters. Network access to the login page is sufficient; no existing account or user interaction is required, and the created application account has read-write privileges, including administrator access.

The record

CVE
CVE-2018-19410
Published
Nov 21, 2018
Updated
Oct 21, 2025
Vendor
Paessler GmbH
Product
PRTG Network Monitor
Classifications
T1136, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 21, 2018CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Paessler GmbH · PRTG Network Monitorversion=n/a

Published CVSS scores

9.8GitHub Advisory DatabaseCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsShadowserver observations through Sep 28, 2026. Gaps indicate unavailable data.
Sep 22, 2026Sep 28, 2026
View daily counts
Reporting dayUnique IPs
Sep 22, 20269
Sep 23, 20266
Sep 24, 20268
Sep 25, 202617
Sep 26, 20265
Sep 27, 202614
Sep 28, 202612
Latest reporting daySep 28, 2026
Latest daily unique IPs12
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

T1136Create Account
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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