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Parallels Plesk PanelApplication · Parallels

CVE-2011-4733

HIGH · 10.0 CVSS v2.0 Published 2011-12-16
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges 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
The Server Administration Panel in Parallels Plesk Panel 10.2.0_build1011110331.18 sends incorrect Content-Type headers for certain resources, which might allow remote attackers to have an unspecified impact by leveraging an interpretation conflict involving smb/admin-home/disable-featured-applications-promo and certain other files. NOTE: it is possible that only clients, not the Plesk product, could be affected by this issue.

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

Parallels Plesk Panel 10.2.0 sends incorrect Content-Type headers for certain resources in its Server Administration Panel, specifically affecting files like smb/admin-home/disable-featured-applications-promo. This misconfiguration can lead to MIME type interpretation conflicts, potentially allowing attackers to exploit browser MIME sniffing behavior for unspecified impact.

MitigationEnsure all resources are served with correct, explicit Content-Type headers matching the actual resource type, and consider upgrading to a patched Plesk version if available.

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
Parallels Plesk PanelApplication
Affected:= 10.2.0_build1011110331.18

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
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

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 Parallels Plesk Panel installation and version
    Check if Plesk Panel is installed by looking for its characteristic directories and files, such as /usr/local/psa/ or C:\Program Files\Parallels\Plesk Panel, and locate the version file (often /usr/local/psa/version or via plesk bin --version)
    Affected if The installed version is Parallels Plesk Panel 10.2.0 build1011110331.18 specifically
  2. Verify Server Administration Panel accessibility
    Attempt to access the Plesk Server Administration Panel via HTTP/HTTPS on port 8443 (default Plesk admin port) or port 80/443 if the admin interface is exposed
    Affected if The Server Administration Panel is accessible and responds to requests
  3. Test affected resource for incorrect Content-Type header
    Send an HTTP GET request to /smb/admin-home/disable-featured-applications-promo through the Server Administration Panel URL and inspect the Content-Type header in the response (e.g., curl -I https://target:8443/smb/admin-home/disable-featured-applications-promo)
    Affected if The response returns an incorrect or missing Content-Type header (such as text/html when it should be a different type, or no explicit Content-Type header is set)
  4. Confirm MIME sniffing vulnerability potential
    Compare the actual Content-Type header returned against the expected MIME type for the resource. If the header is missing, wrong, or ambiguous, browsers may perform MIME sniffing
    Affected if The Content-Type header is missing, incorrectly set to a different MIME type than the resource actually contains, or not explicitly defined, allowing browsers to guess the type

A user is affected if they are running Parallels Plesk Panel version 10.2.0 build1011110331.18 and the /smb/admin-home/disable-featured-applications-promo resource returns an incorrect or missing Content-Type header, potentially enabling MIME sniffing attacks.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Ensure all resources are served with correct, explicit Content-Type headers matching the actual resource type, and consider upgrading to a patched Plesk version if available.

Fix this in Parallels Plesk Panel 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
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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-2011-4733 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