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CpanelApplication

CVE-2018-20922

MEDIUM · 6.1 CVSS v3.0 Published 2019-08-01
Fix available
A fix is available. Upgrade to 70.0.23 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 70.0.23 allows stored XSS via a WHM DNS Cleanup action (SEC-376).

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

Stored cross-site scripting (XSS) vulnerability in cPanel's WHM interface affecting the DNS Cleanup action prior to version 70.0.23. An attacker with access to WHM could inject malicious JavaScript through the DNS Cleanup feature that would execute in the browsers of other WHM users viewing the affected interface.

MitigationUpgrade cPanel to version 70.0.23 or later to receive the security patch for this 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:< 70.0.23

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 the installed cPanel version
    Run `whmapi1 version` or `/usr/local/cpanel/cpanel -V` to determine the current cPanel version
    Affected if The version shown is less than 70.0.23 (for example, 70.0.22 or earlier)
  2. Verify WHM interface is accessible
    Confirm that the Web Host Manager (WHM) interface is accessible and in use in your environment
    Affected if WHM is accessible and users have administrative privileges to access the DNS Cleanup feature
  3. Identify DNS Cleanup feature access
    Check if the DNS Cleanup feature is available in WHM under the DNS functions section
    Affected if The DNS Cleanup feature is present and accessible to users with WHM privileges
  4. Inspect DNS zone configurations for injected scripts
    Review DNS zone files in /var/named/ or via WHM's DNS functions for any unexpected or malicious JavaScript content in TXT records or other DNS fields
    Affected if Unexpected script tags or JavaScript code are found embedded in DNS zone records

Your environment is affected if cPanel version is below 70.0.23 AND WHM with the DNS Cleanup feature is accessible to users who could inject malicious scripts

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 70.0.23 or later
Fixed in 70.0.23
Interim mitigation

Upgrade cPanel to version 70.0.23 or later to receive the security patch for this vulnerability.

Fix this in Cpanel Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing4.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,900
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,040.

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-2018-20922 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