CVE-2016-15049
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 · uneditedNagios Log Server versions prior to 1.4.2 are vulnerable to cross-site scripting (XSS) in the Dashboards section when rendering log entries in the Logs table. Untrusted log content was not safely encoded for the output context, allowing attacker-controlled data present in logs to execute script in the victim’s browser within the application origin.
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 confidenceNagios Log Server versions prior to 1.4.2 contain a stored cross-site scripting (XSS) vulnerability in the Dashboards section's Logs table. Untrusted log content is rendered without proper output encoding, allowing attackers to inject malicious JavaScript that executes in the browsers of users viewing these log entries.
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< 1.4.2CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Determine Nagios Log Server versionLocate the installed Nagios Log Server version number (typically accessible via the web interface footer, About page, or package management system)Affected if The installed version is below 1.4.2 (e.g., 1.4.1, 1.4.0, 1.3.x, etc.)
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Verify Dashboards/Logs feature is accessibleConfirm that the Dashboards section and Logs table functionality is available and enabled in the Nagios Log Server installationAffected if Users have access to the Dashboards/Logs interface and can view log entries through the web UI
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Identify log ingestion sourcesReview the log sources being fed into Nagios Log Server - check which systems, applications, or network streams are forwarding logs to the Nagios Log ServerAffected if Log sources include untrusted or external data (such as remote syslog, WMI collectors, or logs from customer-facing systems) that could contain user-supplied content
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Inspect stored log content for unencoded charactersExamine raw log entries stored in the Nagios Log Server database or displayed in the Logs table - look for log entries containing HTML, JavaScript tags, or script-related attributes that may not have been sanitized upon displayAffected if Log entries containing characters like <script>, javascript:, onerror=, or other HTML/script elements appear in the UI without being escaped or rendered as plain text
A user is affected if their Nagios Log Server version is below 1.4.2 AND they have access to the Dashboards/Logs feature AND their system ingests log content from untrusted sources that could contain malicious script payloads.
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 · scoped1.4.2
Upgrade to Nagios Log Server version 1.4.2 or later. Until then, restrict access to the Dashboards/Logs functionality to trusted users only and implement output encoding for all log data displayed in the UI.
1.4.2
- Backup your current Nagios Log Server data and configuration
- Download Nagios Log Server version 1.4.2 or later from the official Nagios website (www.nagios.com)
- Follow the official Nagios Log Server upgrade documentation for your specific installation method
- Apply the upgrade following the documented procedures
- Verify the upgrade was successful by checking the version number
- Test that the XSS vulnerability in the Dashboards/Logs table section is resolved by verifying log entries are properly encoded
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2016-15049 — 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-2016-15049 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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- 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