CVE-2020-9405
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 · uneditedIBL Online Weather before 4.3.5a allows unauthenticated reflected XSS via the redirect page.
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 confidenceIBL Online Weather before version 4.3.5a contains an unauthenticated reflected cross-site scripting (XSS) vulnerability in the redirect page. Attackers can inject malicious JavaScript through unsanitized input in the redirect parameter, which is reflected back to users in the HTTP response.
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< 4.3.5CVSS 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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Identify the installed version of IBL Online WeatherLocate the version information in the application's main interface, about page, or check the software documentation for the version number displayed in the application header or footerAffected if The displayed version number is less than 4.3.5 or 4.3.5a
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Determine if the redirect page is accessibleAttempt to access the redirect endpoint using the application's URL structure, typically through a browser or HTTP client by navigating to a path containing 'redirect' or by inspecting web server logs for requests to redirect-related URLsAffected if The redirect page responds with HTTP 200 and renders user-supplied input back in the response
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Test for reflected parameter handlingSend a crafted HTTP request to the redirect page with a test value in the redirect parameter (for example, ?redirect=test123) and observe if this value appears in the server response body without proper encodingAffected if The submitted parameter value is reflected verbatim in the HTML response without sanitization or encoding
The environment is affected if IBL Online Weather version is below 4.3.5a AND the redirect page functionality is accessible and reflects unsanitized input from the redirect parameter back to the user.
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 data4.3.5
Upgrade to IBL Online Weather version 4.3.5a or later. Until patched, implement proper input validation and output encoding on the redirect page to neutralize malicious script payloads.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-9405 — 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-2020-9405 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
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