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Nagios XiApplication · Nagios

CVE-2011-10040

MEDIUM · 5.4 CVSS v3.1 Published 2025-10-30
Fix available
A fix is available. Upgrade to after 2009 or later.
See remediation →
58/100
Remediation priority · Elevated
Remotely reachable

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 · unedited
Nagios XI versions prior to 2011R1.9 are vulnerable to cross-site scripting (XSS) via the link-handling functions used by status and report pages. Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser.

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 confidence

Nagios XI versions prior to 2011R1.9 contain a reflected cross-site scripting (XSS) vulnerability in the link-handling functions used by status and report pages. The application fails to properly validate or escape user-supplied input before rendering it in HTML output, allowing attackers to inject malicious JavaScript that executes in the context of authenticated users' browsers.

MitigationUpgrade Nagios XI to version 2011R1.9 or later to obtain the vendor patch. If immediate upgrade is not feasible, implement input validation and output encoding on all status and report page link parameters as a compensating control.

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
Nagios XiApplication
Affected:<= 2009= 2011

CVSS 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
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify Nagios XI installation and version
    Access the Nagios XI web interface and check the version information, typically found in the Help > About section, or run 'grep -i version /usr/local/nagiosxi/etc/system.inc' if you have command line access
    Affected if The installed version is 2011 or earlier (versions <= 2009 or = 2011 are affected)
  2. Confirm status page accessibility
    Navigate to the Nagios XI status map or status page (typically at /nagiosxi/frontend/nagiosxi/includes/components/nagioscore/ui/views/ or similar status-related URLs)
    Affected if The status page is accessible without additional authentication beyond normal Nagios XI login
  3. Confirm report page accessibility
    Navigate to the Nagios XI report functionality (typically at /nagiosxi/frontend/nagiosxi/includes/components/reports/ or similar report-related URLs)
    Affected if The report page is accessible without additional authentication beyond normal Nagios XI login
  4. Test link parameter handling for XSS
    Inspect the URL parameters used in status and report pages (look for parameters in the URL query string that handle links or navigation), then attempt to identify if those parameters are reflected in the HTML output without encoding - you may use a browser developer tool or proxy to observe how user-supplied values in URL parameters are rendered back in the page
    Affected if User-supplied input in URL parameters (especially link-related parameters) is reflected in the HTML output without proper encoding or validation

A user is affected if they are running Nagios XI version 2011 or earlier and have the status or report pages accessible to authenticated users, as the vulnerability exists in the link-handling functions of these pages.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to a release after 2009
Interim mitigation

Upgrade Nagios XI to version 2011R1.9 or later to obtain the vendor patch. If immediate upgrade is not feasible, implement input validation and output encoding on all status and report page link parameters as a compensating control.

Recommended fix Moderate confidence

Nagios XI 2011R1.9 or later

  1. 1. Backup your current Nagios XI installation and database before upgrading
  2. 2. Download Nagios XI version 2011R1.9 or later from the official Nagios website (www.nagios.com)
  3. 3. Run the Nagios XI upgrade installer following the official upgrade documentation
  4. 4. After upgrade, verify the installation is working correctly
  5. 5. Test that the status and report pages function properly with the new version
  6. 6. Confirm the XSS vulnerability is resolved by testing with legitimate input in link-handling functions
Caveat Review Nagios XI 2011R1.9 release notes for any configuration or feature changes that may require adjustment

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Nagios Xi Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing3.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,210
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2011-10040 in production — separate from our analysis above.

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What this is

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.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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