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CpanelApplication

CVE-2020-26111

MEDIUM · 6.1 CVSS v3.1 Published 2020-09-25
Fix available
A fix is available. Upgrade to 90.0.10 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 90.0.10 allows self XSS via the WHM Edit DNS Zone interface (SEC-566).

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

Self XSS vulnerability in cPanel's WHM Edit DNS Zone interface allows attackers to inject malicious JavaScript through unsanitized input that gets reflected back to the user. This affects cPanel versions before 90.0.10.

MitigationUpgrade cPanel to version 90.0.10 or later to patch the vulnerability. The WHM Edit DNS Zone interface should also implement proper input sanitization and output encoding to prevent XSS.

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:< 90.0.10

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:3.1/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 installed cPanel version
    Access WHM and navigate to Server Information > cPanel Version, or run command: /usr/local/cpanel/cpanel -V
    Affected if version is below 90.0.10
  2. Verify WHM Edit DNS Zone interface is accessible
    Log into WHM and confirm access to DNS Functions > Edit DNS Zone or navigate to Home > DNS Functions > Edit DNS Zone
    Affected if the interface is available and reachable in the environment
  3. Confirm version is in affected range
    Compare your installed version number to 90.0.10 - any version before 90.0.10 (such as 89.x, 88.x, etc.) falls within the affected range
    Affected if installed version is less than 90.0.10

You are affected if your cPanel installation is version 90.0.10 or lower and the WHM Edit DNS Zone interface is accessible in your environment.

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 90.0.10 or later
Fixed in 90.0.10
Interim mitigation

Upgrade cPanel to version 90.0.10 or later to patch the vulnerability. The WHM Edit DNS Zone interface should also implement proper input sanitization and output encoding to prevent XSS.

Fix this in Cpanel Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.

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-2020-26111 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