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Nagios XiApplication · Nagios

CVE-2011-10039

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 Alert Heatmap report and the “My Reports” listing of the web interface. 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 · moderate confidence

Nagios XI versions before 2011R1.9 contain stored cross-site scripting (XSS) vulnerabilities in the Alert Heatmap report and 'My Reports' listing. The vulnerability stems from insufficient validation or escaping of user-supplied input, allowing attackers to inject and execute arbitrary JavaScript in the context of a victim's browser.

MitigationUpgrade to Nagios XI 2011R1.9 or later, which contains the security patch for proper input validation and output encoding.

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 installed Nagios XI version
    Locate the Nagios XI version information, typically found in the web interface (usually on the admin page or in the footer of pages) or in the configuration files on the server
    Affected if The installed version is either any version <= 2009, or specifically version 2011 (any subversion before 2011R1.9)
  2. Verify Alert Heatmap feature is accessible
    Navigate to the Alert Heatmap report section within the Nagios XI web interface to confirm the feature exists and is accessible
    Affected if The Alert Heatmap feature is present and accessible to users with reporting privileges
  3. Verify My Reports feature is accessible
    Navigate to the My Reports listing section within the Nagios XI web interface to confirm the feature exists and is accessible
    Affected if The My Reports listing is present and accessible to authenticated users
  4. Confirm input injection point in Alert Heatmap
    Inspect the Alert Heatmap report functionality to determine if user-supplied input fields (such as report titles, host names, or description fields) are submitted and stored without proper validation
    Affected if User-supplied input is accepted and displayed in the report without sanitization or encoding
  5. Confirm input injection point in My Reports
    Inspect the My Reports listing to determine if user-supplied input fields (such as report names or descriptions) are submitted and stored without proper validation
    Affected if User-supplied input is accepted and displayed in the report listing without sanitization or encoding

A user is affected if their Nagios XI version is 2011 or any version <= 2009 AND they have access to either the Alert Heatmap or My Reports features where unsanitized user input can be injected and stored.

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 to Nagios XI 2011R1.9 or later, which contains the security patch for proper input validation and output encoding.

Recommended fix High confidence

Nagios XI 2011R1.9 or later

  1. 1. Create a full backup of the current Nagios XI installation and database
  2. 2. Download Nagios XI version 2011R1.9 or later from the official Nagios website (www.nagios.com)
  3. 3. Review Nagios upgrade documentation for the specific upgrade procedure
  4. 4. Execute the upgrade following the documented upgrade path for your current version
  5. 5. After upgrade, verify the Alert Heatmap report and My Reports functionality work correctly
  6. 6. Confirm the XSS vulnerability is resolved by attempting to inject test scripts in the affected input fields
Caveat Review release notes for any breaking changes between your current version and 2011R1.9; test in non-production environment first

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

Fix this in Nagios Xi Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,640
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,224.

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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-2011-10039 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
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data