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CpanelApplication

CVE-2017-18402

MEDIUM · 5.4 CVSS v3.0 Published 2019-08-02
Fix available
A fix is available. Upgrade to 62.0.35 / 64.0.42 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
cPanel before 68.0.15 allows stored XSS during a cpaddons moderated upgrade (SEC-336).

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

cPanel before version 68.0.15 contains a stored Cross-Site Scripting (XSS) vulnerability that occurs during a cpaddons moderated upgrade (SEC-336). An authenticated attacker can inject malicious scripts into the upgrade process that persist and execute when other users interact with the affected cpaddons functionality.

MitigationUpgrade cPanel to version 68.0.15 or later to remediate this stored XSS 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
CpanelApplication
Affected:>= 61.9999.55, < 62.0.35>= 63.9999.74, < 64.0.42>= 65.9999.38, < 66.0.34>= 67.9999.64, < 68.0.15

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. Determine installed cPanel version
    Run the command: /usr/local/cpanel/cpanel -V or check via WHM under Server Information > cPanel Version
    Affected if The version falls within one of these ranges: 61.9999.55 to 62.0.34, 63.9999.74 to 64.0.41, 65.9999.38 to 66.0.33, or 67.9999.64 to 68.0.14
  2. Verify cpaddons feature is accessible
    Check if the cpaddons functionality exists on the system by looking for /usr/local/cpanel/bin/cpaddons or by accessing cPanel >> Plugins >> cPaddons in the web interface
    Affected if The cpaddons feature is present and accessible to authenticated users
  3. Inspect cpaddons configuration for injected scripts
    Examine the cpaddons configuration files in /var/cpanel/cpaddons/ or database entries for any suspicious JavaScript tags, script elements, or event handlers in upgrade-related fields
    Affected if Unexpected script tags or javascript: URIs are found in cpaddons upgrade configuration data

A system is affected if it runs cPanel version 62.0.34 or earlier in the 62 branch, 64.0.41 or earlier in the 64 branch, 66.0.33 or earlier in the 66 branch, or 68.0.14 or earlier in the 68 branch AND has the cpaddons functionality accessible to users.

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 62.0.35 / 64.0.42 / 66.0.34 or later
Fixed in 62.0.3564.0.4266.0.34
Interim mitigation

Upgrade cPanel to version 68.0.15 or later to remediate this stored XSS vulnerability.

Fix this in Cpanel Scoped from the published advisory
  • Consultation4.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,180
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,488.

Scan for this in your stack

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dbcve dependency scanner

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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-2017-18402 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