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Joomla\!Application · Joomla

CVE-2024-21731

MEDIUM · 6.1 CVSS v3.1 Published 2024-07-09
Fix available
A fix is available. Upgrade to after 5.1.1 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
Improper handling of input could lead to an XSS vector in the StringHelper::truncate method.

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

A cross-site scripting (XSS) vulnerability exists in the StringHelper::truncate method due to improper handling of user input. The method fails to sanitize or properly encode input before rendering it in a web context, allowing an attacker to inject malicious scripts that execute in a victim's browser.

MitigationImplement proper input sanitization and output encoding in the StringHelper::truncate method, ensuring all user-supplied data is escaped before being rendered. Consider using established sanitization libraries appropriate to the application's framework.

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:>= 3.0.0, <= 3.10.15>= 4.0.0, <= 4.4.5>= 5.0.0, <= 5.1.1

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 Joomla version
    Log into the Joomla administrator panel and navigate to System > Information > Joomla! Version. Alternatively, check the file libraries/src/String/StringHelper.php or libraries/classmap.php in the installation directory for version constants.
    Affected if The installed version falls within 3.0.0 to 3.10.15, 4.0.0 to 4.4.5, or 5.0.0 to 5.1.1.
  2. Locate the StringHelper::truncate method
    Search for the file containing the StringHelper class, typically found at libraries/src/String/StringHelper.php in the Joomla installation. Open the file and locate the truncate method definition.
    Affected if The file exists and contains a truncate method that does not perform output encoding on the input string.
  3. Verify lack of input sanitization in truncate method
    Examine the truncate method code. Look for calls to functions like htmlspecialchars, JHtml::_ (with behavior.encoding) or other encoding functions on the input parameter before returning the truncated string.
    Affected if The method processes the $html input parameter without applying encoding functions, directly returning unescaped content.
  4. Check for usage of truncate with user-supplied data
    Search the codebase for calls to StringHelper::truncate() or\PlSystemHelper::truncate() where the first argument ($html) receives data from request parameters, database queries, or other user-controlled sources.
    Affected if The truncate method is being called with unsanitized user input from $_GET, $_POST, or database fields.

You are affected if your Joomla version is within the listed ranges AND the StringHelper::truncate method processes user input without output encoding.

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 a release after 5.1.1
Interim mitigation

Implement proper input sanitization and output encoding in the StringHelper::truncate method, ensuring all user-supplied data is escaped before being rendered. Consider using established sanitization libraries appropriate to the application's framework.

Recommended fix Moderate confidence

Joomla! 3.10.16 (or later), 4.4.6 (or later), or 5.1.2 (or later) - upgrade to the latest stable version in your current major branch

  1. 1. Backup your Joomla! website database and files before proceeding with any upgrade.
  2. 2. Navigate to the Joomla! Administrator dashboard.
  3. 3. Go to System > Global Configuration > Joomla! Update tab, or check for updates directly.
  4. 4. If automatic updates are not available, download the appropriate update package from the official Joomla! downloads page (downloads.joomla.org).
  5. 5. Install the update through Extensions > Manage > Install, or use the built-in update functionality.
  6. 6. Verify the StringHelper::truncate method behavior in your templates and extensions after the update.
  7. 7. Test critical user-facing pages to confirm the XSS vulnerability is remediated and no regressions exist.
Caveat Review Joomla! release notes before upgrading; major version jumps (e.g., 3.x to 4.x or 4.x to 5.x) may require template/component compatibility checks

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
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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-2024-21731 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