CVE-2023-51630
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 · uneditedPaessler PRTG Network Monitor Cross-Site Scripting Authentication Bypass Vulnerability. This vulnerability allows remote attackers to bypass authentication on affected installations of Paessler PRTG Network Monitor. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the web console. The issue results from the lack of proper validation of user-supplied data, which can lead to the injection of an arbitrary script. An attacker can leverage this vulnerability to bypass authentication on the system. . Was ZDI-CAN-21182.
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 · moderate confidenceA cross-site scripting (XSS) vulnerability in the Paessler PRTG Network Monitor web console allows injection of arbitrary JavaScript due to lack of proper validation of user-supplied data. This XSS can be leveraged to steal session tokens or credentials, enabling authentication bypass on the affected system.
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< 24.1.90.1306CVSS 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
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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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Check PRTG Network Monitor versionOpen PRTG Administrator Tool or navigate to Setup > About in the web interface. The version number is displayed on the main screen.Affected if Installed version is less than 24.1.90.1306
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Verify web console is accessibleAttempt to access the PRTG web interface by browsing to the server hostname or IP on port 80 or 443. Confirm the login page loads.Affected if Web console is exposed and running on the network
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Check session management configurationIn the web interface, go to Setup > System Administration > User Accounts. Review session timeout settings and authentication methods configured.Affected if Session tokens can be intercepted due to XSS and used for authentication bypass
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Identify user input points in web consoleNavigate through the PRTG web interface and identify any fields that accept user-supplied data such as device names, sensor names, group names, or notification settings.Affected if User-supplied data can be injected into the web interface without sanitization
The environment is affected if PRTG Network Monitor version is below 24.1.90.1306 and the web console is accessible to users or attackers.
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.
dbcve · scoped24.1.90.1306
Apply the vendor patch or update to a fixed version of PRTG Network Monitor. Implement robust input validation and output encoding on all user-supplied data within the web console.
24.1.90.1306 or later
- Identify current PRTG Network Monitor version through the web console or system information
- Backup PRTG configuration and database before upgrading
- Download PRTG Network Monitor version 24.1.90.1306 or later from the official Paessler website
- Upgrade PRTG Network Monitor to the fixed version following standard upgrade procedures
- Verify the upgrade was successful and the vulnerability is resolved
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing5.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,752.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-51630 — 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-2023-51630 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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