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Joomla\!Application · Joomla

CVE-2026-48953

MEDIUM · 6.1 CVSS v3.1 Published 2026-07-07
Fix available
A fix is available. Upgrade to 5.4.7 / 6.1.2 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges 6 weeks old

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
Lack of escaping leads to an XSS vulnerability in the generic image output layout.

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

Cross-site scripting (XSS) vulnerability in the generic image output layout due to insufficient input escaping. User-supplied data rendered in image output contexts is not properly sanitized, allowing injection of malicious scripts that execute in victim browsers.

MitigationImplement proper output encoding/escaping for all user-supplied data in the image output layout, using context-appropriate encoding (HTML entity encoding for HTML contexts, attribute encoding for tag attributes).

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:>= 4.0.0, < 5.4.7>= 6.0.0, < 6.1.2

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. Identify your Joomla version
    Access the Joomla administrator dashboard and navigate to System > Information > System Information, or check the libraries/cms.php file for the VERSION constant
    Affected if The installed version is >= 4.0.0 and < 5.4.7, or >= 6.0.0 and < 6.1.2
  2. Locate the generic image output layout file
    In the Joomla installation, navigate to /layouts/joomla/html/ and identify files related to image rendering (such as image.php or similar layout files that handle image output)
    Affected if The vulnerable layout file exists in the installation and contains rendering logic for user-supplied data
  3. Verify if user-supplied data flows into image output contexts
    Examine the layout code for variables that contain user input (request parameters, article content, custom fields) being rendered without proper escaping functions such as htmlspecialchars or JHtml::_('escape')
    Affected if User-supplied data is being rendered in image-related output without proper encoding/escaping applied
  4. Check for custom templates or overrides using the vulnerable layout
    Review any template overrides in /templates/YOUR_TEMPLATE/html/layouts/joomla/html/ that may override the image output layout and similarly lack escaping
    Affected if Custom template overrides exist and render user input without proper sanitization in image contexts

Your environment is affected if you are running a Joomla version within the affected ranges AND the generic image output layout is in use with user-supplied data being rendered without proper escaping.

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.

dbcve · scoped
Upgrade available Upgrade to 5.4.7 / 6.1.2 or later
Fixed in 5.4.76.1.2
Interim mitigation

Implement proper output encoding/escaping for all user-supplied data in the image output layout, using context-appropriate encoding (HTML entity encoding for HTML contexts, attribute encoding for tag attributes).

Recommended fix High confidence

Joomla! 5.4.7 or Joomla! 6.1.2

  1. 1. Back up your Joomla! site database and files
  2. 2. Ensure you have a recent backup of your site before proceeding
  3. 3. Download Joomla! 5.4.7 or Joomla! 6.1.2 from the official Joomla! download page
  4. 4. Install the update through the Joomla! Administrator dashboard via Components > Joomla! Update, or manually upload the update package
  5. 5. After updating, clear any site caches
  6. 6. Verify the update was successful by checking the version in Administrator > System > Information
Caveat Standard Joomla minor version upgrades typically have minimal breaking changes; test in staging if possible

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Joomla\! Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.

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-2026-48953 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