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CpanelApplication

CVE-2018-20953

MEDIUM · 6.1 CVSS v3.0 Published 2019-08-01
Fix available
A fix is available. Upgrade to 62.0.39 / 66.0.35 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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 68.0.27 allows self XSS in the WHM listips interface (SEC-389).

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 confidence

Self XSS vulnerability in cPanel's WHM listips interface affecting versions before 68.0.27. Self XSS requires a victim to manually inject malicious script into the vulnerable field through social engineering, rather than a direct attacker-controlled reflection.

MitigationUpgrade cPanel to version 68.0.27 or later to remediate. As a defensive measure, disable or restrict access to the WHM listips interface until the upgrade can be performed.

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, < 62.0.39>= 65.9999.38, < 66.0.35>= 67.9999.64, < 68.0.27

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
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 checks

Work through these to decide whether this CVE applies to you.

  1. Check cPanel/WHM version
    Log into WHM and navigate to Server Status > cPanel Version, or run command: /usr/local/cpanel/cpanel -V
    Affected if version is 61.9999.55 through 62.0.38, OR 65.9999.38 through 66.0.34, OR 67.9999.64 through 68.0.26
  2. Verify WHM listips interface accessibility
    Access WHM and navigate to IP Functions > Show IP Address Usage (listips), or check if the /cpanelwebcall/ endpoint is exposed
    Affected if the WHM listips interface is accessible to user accounts who could inject content into the IP address fields
  3. Confirm Self XSS vulnerable fields exist
    In WHM, go to IP Functions > Show IP Address Usage and inspect whether the IP address fields or related inputs accept and reflect unescaped HTML/JavaScript characters
    Affected if the interface reflects user-supplied input in IP address fields without proper sanitization

You are affected if your cPanel version falls within 61.9999.55-62.0.38, 65.9999.38-66.0.34, or 67.9999.64-68.0.26 AND the WHM listips interface is accessible to users who could inject malicious scripts into input fields.

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 62.0.39 / 66.0.35 / 68.0.27 or later
Fixed in 62.0.3966.0.3568.0.27
Interim mitigation

Upgrade cPanel to version 68.0.27 or later to remediate. As a defensive measure, disable or restrict access to the WHM listips interface until the upgrade can be performed.

Fix this in Cpanel Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2018-20953 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

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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-2018-20953 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