CVE-2017-1000063
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 · uneditedkittoframework kitto version 0.5.1 is vulnerable to an XSS in the 404 page resulting in information disclosure
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 confidencekittoframework kitto version 0.5.1 contains a Cross-Site Scripting (XSS) vulnerability in its 404 error page. The vulnerability allows remote attackers to inject malicious script content through unsanitized input reflected in the 404 response, potentially leading to session hijacking, credential theft, or other information disclosure attacks against users encountering invalid URLs.
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= 0.5.1CVSS 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:3.0/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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Identify Kitto installation and versionLocate the Kitto framework installation and determine the installed version number. Check package metadata, gemfile, or version file depending on how Kitto was installed.Affected if The installed version is exactly 0.5.1.
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Confirm Kitto web server is runningDetermine if a web application built with Kitto framework is currently accessible and serving HTTP requests.Affected if Kitto is running as a web server and accessible over the network.
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Trigger a 404 error responseSend an HTTP request to the Kitto server for a non-existent path, such as GET /nonexistent-page-12345.Affected if The server responds with a 404 error page.
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Inspect 404 response for unsanitized URL reflectionExamine the 404 response body. Look for the requested URL or path you sent in step 3 being reflected directly in the HTML output without encoding or sanitization.Affected if The requested URL path appears in the 404 page HTML without proper HTML encoding (e.g., <script> tags would execute if injected).
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Verify XSS vulnerability with test payloadRequest a URL containing a simple XSS test payload like /<script>alert(1)</script> and check if the 404 page renders the script tag unescaped.Affected if The script tag or other HTML special characters are rendered as-is in the 404 response, allowing JavaScript execution.
A user is affected if running Kitto version 0.5.1 as a web server and the 404 error page reflects the requested URL without sanitization, allowing injected script execution.
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 dataUpgrade kittoframework to a version that addresses this vulnerability, or implement proper output encoding and input validation on all error pages to prevent XSS reflection of user-supplied data such as the requested URL.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 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 $5,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-1000063 — 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-2017-1000063 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