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Joomla\!Application · Joomla

CVE-2018-6378

MEDIUM · 6.1 CVSS v3.0 Published 2018-05-22
Fix available
A fix is available. Upgrade to 3.8.8 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
In Joomla! Core before 3.8.8, inadequate filtering of file and folder names leads to various XSS attack vectors in the media manager.

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

Joomla! Core versions before 3.8.8 contain an XSS vulnerability in the media manager component due to inadequate filtering of file and folder names. Attackers can inject malicious script content through improperly sanitized filenames when uploading or managing media files.

MitigationUpgrade Joomla! Core to version 3.8.8 or later to obtain the patched input filtering. If immediate upgrade is not feasible, restrict media manager access to trusted users only until the patch can be applied.

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
Joomla\!Application
Affected:< 3.8.8

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. Determine Joomla Core version
    Log into the Joomla Administrator dashboard and navigate to Help > System Information > Joomla! Version, or check the version.php file in the /libraries/cms/version/ directory
    Affected if The installed version is 3.8.7 or earlier (any version below 3.8.8)
  2. Verify media manager component status
    Navigate to Components > Media Manager in the Joomla Administrator panel, or check the component status in the #__extensions database table where element = 'media'
    Affected if The media manager component is enabled and accessible
  3. Check user access to media manager
    Navigate to Users > Access Levels in the administrator panel and verify which user groups have access to the media manager component via the Media Manager option in the component permissions
    Affected if Any user group beyond only Super Users has access to upload or manage media files

Your environment is affected if the Joomla Core version is below 3.8.8 AND the media manager component is enabled with access granted to users who can upload or create files/folders.

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 3.8.8 or later
Fixed in 3.8.8
Interim mitigation

Upgrade Joomla! Core to version 3.8.8 or later to obtain the patched input filtering. If immediate upgrade is not feasible, restrict media manager access to trusted users only until the patch can be applied.

Fix this in Joomla\! Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,664.

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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-2018-6378 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