CVE-2018-0716
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 · uneditedCross-site scripting vulnerability in QTS 4.2.6 build 20180711, QTS 4.3.3: Qsync Central 3.0.2, QTS 4.3.4: Qsync Central 3.0.3, QTS 4.3.5: Qsync Central 3.0.4 and earlier versions could allow remote attackers to inject Javascript code in the compromised application.
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 confidenceCross-site scripting (XSS) vulnerability in QNAP QTS firmware's Qsync Central web application. Attackers can inject malicious JavaScript code through unsanitized user input in the Qsync interface, potentially hijacking sessions or stealing credentials.
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= 4.2.6= 4.3.3= 4.3.4= 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:3.0/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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Check QTS firmware versionLog into the QNAP admin interface and view the firmware version displayed on the main dashboard, or navigate to Control Panel > System > Firmware Update to see the exact build numberAffected if The installed version is 4.2.6, 4.3.3, 4.3.4, or 4.3.5 exactly (these are the specific affected builds)
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Verify Qsync Central is enabledNavigate to Control Panel > Applications > Qsync Central, or attempt to access the Qsync Central web interface via the QNAP IP on port 8080 or /qsync endpointAffected if Qsync Central is enabled and accessible via the web interface
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Confirm Qsync user input fields existAccess the Qsync Central interface and locate user-configurable fields such as folder names, share links, or user profile settings where unsanitized input could be injectedAffected if The Qsync Central web application is operational with user input fields present
You are affected if your QTS firmware matches one of the specific builds (4.2.6, 4.3.3, 4.3.4, or 4.3.5) AND the Qsync Central application is enabled and accessible in your environment.
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 dataUpdate QTS firmware to versions newer than the affected builds (4.2.6 build 20180711, 4.3.3-4.3.5) which contain the patched Qsync Central component. If immediate patching is not possible, disable Qsync Central or restrict network access to the management interface.
- Consultation1.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-0716 — 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-2018-0716 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