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CpanelApplication

CVE-2016-10836

MEDIUM · 6.5 CVSS v3.0 Published 2019-08-01
Fix available
A fix is available. Upgrade to 11.50.5.2 / 11.52.4.1 or later.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable Zero-click

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 55.9999.141 allows arbitrary file-read operations during authentication with caldav (SEC-108).

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

cPanel versions prior to 55.9999.141 contain a vulnerability in the CalDAV authentication component that allows authenticated users to perform arbitrary file-read operations on the server. This is a path traversal or improper access control issue within the CalDAV functionality.

MitigationUpgrade cPanel to version 55.9999.141 or later. Review server access logs for suspicious CalDAV authentication attempts during the vulnerable period.

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:>= 11.50.0.4, < 11.50.5.2>= 11.51.9999.98, < 11.52.4.1>= 11.54.0.0, < 11.54.0.20>= 55.9999.61, < 55.9999.141

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
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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. Identify cPanel version
    Run the command: /usr/local/cpanel/version or check WHM interface under Server Status > cPanel Version
    Affected if The installed version falls within any of these ranges: 11.50.0.4 to 11.50.5.2, 11.51.9999.98 to 11.52.4.1, 11.54.0.0 to 11.54.0.20, or 55.9999.61 to 55.9999.141
  2. Verify CalDAV functionality is accessible
    Check if CalDAV module is enabled on the server. This can be confirmed by attempting to access the CalDAV endpoint at /caldav or reviewing cPanel service configurations in WHM under Plugins or Service Configuration sections
    Affected if CalDAV is enabled and accessible on the cPanel server
  3. Confirm user authentication method
    Review how users authenticate to cPanel services. The vulnerability affects authenticated users performing arbitrary file-read via CalDAV
    Affected if Users authenticate to cPanel and have CalDAV access credentials

You are affected if your cPanel version is in the affected ranges AND CalDAV functionality is enabled and accessible to authenticated users on your server.

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 11.50.5.2 / 11.52.4.1 / 11.54.0.20 or later
Fixed in 11.50.5.211.52.4.111.54.0.20
Interim mitigation

Upgrade cPanel to version 55.9999.141 or later. Review server access logs for suspicious CalDAV authentication attempts during the vulnerable period.

Fix this in Cpanel Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.

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-2016-10836 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