dbcve.org
Diskstation ManagerOperating system · Synology

CVE-2018-8917

MEDIUM · 5.4 CVSS v3.0 Published 2018-12-24
Fix available
A fix is available. Upgrade to 6.1.6-15266 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
Cross-site scripting (XSS) vulnerability in info.cgi in Synology DiskStation Manager (DSM) before 6.1.6-15266 allows remote attackers to inject arbitrary web script or HTML via the host 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 · high confidence

Reflected XSS vulnerability in Synology DiskStation Manager's info.cgi script. The host parameter is not properly sanitized, allowing attackers to inject malicious HTML or JavaScript that executes in victim browsers.

MitigationUpdate DSM to version 6.1.6-15266 or later to patch the vulnerability.

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
Diskstation ManagerOperating system
Affected:< 6.1.6-15266

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:3.0/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. Confirm Synology DiskStation Manager is installed
    Access the admin interface or check system information to verify the device is running Synology DSM.
    Affected if The device is not running Synology DiskStation Manager.
  2. Identify the installed DSM version
    In DSM, go to Control Panel > System > System Information > Version, or query the system via SSH with 'cat /proc/version' or 'synoinfo -v'.
    Affected if The installed version is lower than 6.1.6-15266.
  3. Locate the info.cgi script
    Access the web interface path /webman/info.cgi via HTTP/HTTPS, for example: https://YOUR_DSM_IP/webman/info.cgi
    Affected if The info.cgi script is reachable and responds to requests.
  4. Test the host parameter for XSS
    Send a crafted request to info.cgi with a test payload in the host parameter, such as: /webman/info.cgi?host=<script>alert(1)</script>
    Affected if The response reflects the unsanitized host parameter back in the HTML output.

A system is affected if it is running Synology DiskStation Manager with a version prior to 6.1.6-15266 and the info.cgi script is accessible with user-supplied input reflected in the response.

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.

From vendor data
Upgrade available Upgrade to 6.1.6-15266 or later
Fixed in 6.1.6-15266
Interim mitigation

Update DSM to version 6.1.6-15266 or later to patch the vulnerability.

Fix this in Diskstation Manager Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

Scan for this in your stack

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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-2018-8917 in production — separate from our analysis above.

No notes yet

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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