CVE-2017-7855
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 · uneditedIn the webmail component in IceWarp Server 11.3.1.5, there was an XSS vulnerability discovered in the "language" parameter.
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 confidenceA reflected Cross-Site Scripting (XSS) vulnerability exists in the IceWarp Server 11.3.1.5 webmail component. The 'language' parameter is not properly sanitized, allowing an attacker to inject malicious JavaScript code that executes in the context of a victim's browser when they access a crafted URL.
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= 11.3.1.5CVSS 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:3.0/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 if IceWarp Server is installedCheck for IceWarp installation directories (typically C:\Program Files\IceWarp or /var/www/icewarp on Linux), or look for the IceWarp service running on the systemAffected if IceWarp Server is installed and running on the system
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Confirm the IceWarp Server versionAccess the webmail admin panel or check the installed version through the IceWarp server administration interface. On Linux, you can also check the version file in the installation directory or run: 'grep -r "11.3.1.5" /path/to/icewarp'Affected if The installed version is exactly 11.3.1.5
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Verify webmail component accessibilityCheck if the IceWarp webmail interface is accessible. Typically available at http://<server>:32000/ or /webmail/ endpoint. Confirm the webmail service is runningAffected if The webmail component is exposed and accessible over HTTP/HTTPS
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Test the language parameter for XSS vulnerabilityAccess a URL such as: http://<server>:32000/?language=<script>alert('XSS')</script> or similar endpoint where the language parameter is used. Observe if the script tag is reflected unsanitized in the responseAffected if The language parameter reflects user input without sanitization and the injected script executes in the browser
The system is affected if IceWarp Server version 11.3.1.5 is installed with the webmail component accessible and the language parameter reflects unsanitized input in the HTTP response.
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 dataImplement proper input validation and output encoding for the 'language' parameter. Sanitize user-supplied input to remove or escape HTML/script tags before reflecting it back in the response. Consider implementing a Content Security Policy (CSP) as an additional defense-in-depth measure.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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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 sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2017-7855 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
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- Version or environment caveats, and links to real fixes
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