CVE-2018-19411
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedPRTG Network Monitor before 18.2.40.1683 allows an authenticated user with a read-only account to create another user with a read-write account (including administrator) via an HTTP request because /api/addusers doesn't check, or doesn't properly check, user rights.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidencePRTG Network Monitor versions before 18.2.40.1683 contain an improper authorization vulnerability in the /api/addusers endpoint. An authenticated user with only read-only permissions can send a crafted HTTP request to create new user accounts with full administrative privileges, effectively bypassing the application's role-based access control checks.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 18.2.40.1683CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed PRTG versionAccess the PRTG web interface and navigate to Setup > About > License, or check the version displayed on the login page. Alternatively, check the version from the installer or program files.Affected if The installed version is lower than 18.2.40.1683
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Verify read-only user accounts existIn the PRTG web interface, go to Setup > Account Settings > User Accounts and review the list of users. Note which users have the "Read Only" or "Read Only User" role assigned.Affected if Any read-only user accounts exist in the system
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Check for unauthorized administrative accountsIn the PRTG web interface, go to Setup > Account Settings > User Accounts and examine all accounts. Look for administrator-level accounts that were not created by known legitimate administrators.Affected if There are administrative user accounts that cannot be traced to authorized creation by a proper administrator
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Review user audit logs for account creationIn the PRTG web interface, go to Setup > System Administration > History or Logs. Search for events related to user account creation, specifically those performed by read-only users.Affected if Any user account creation events were performed by users with only read-only permissions
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Inspect HTTP access to the addusers API endpointReview web server logs or proxy logs for POST requests to /api/addusers. Check the source IP and authenticated user associated with these requests.Affected if HTTP POST requests to /api/addusers were made by users who only have read-only permissions
A user is affected if they are running PRTG Network Monitor version lower than 18.2.40.1683 and have read-only users who were able to create administrative accounts through the /api/addusers endpoint.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data18.2.40.1683
Upgrade PRTG Network Monitor to version 18.2.40.1683 or later. If immediate patching is not possible, restrict network access to the /api/addusers endpoint and monitor for unauthorized user creation events.
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- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-19411 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2018-19411 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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