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Beaver BuilderWordPress extension · Fastlinemedia

CVE-2024-43926

MEDIUM · 6.1 CVSS v3.1 Published 2024-08-29
Fix available
A fix is available. Upgrade to 2.8.3.4 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 Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Beaver Builder Team Beaver Builder allows Reflected XSS.This issue affects Beaver Builder: from n/a through 2.8.3.2.

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

Reflected XSS vulnerability in Beaver Builder plugin versions through 2.8.3.2 allows attackers to inject malicious scripts via unsanitized user input that gets reflected in web pages without proper encoding, potentially enabling session hijacking, credential theft, or phishing attacks.

MitigationUpdate to patched Beaver Builder version when available; implement WAF rules and output encoding as interim measure; audit code for other XSS vectors.

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
Beaver BuilderWordPress extension
Affected:< 2.8.3.4

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. Locate Beaver Builder plugin version
    In WordPress admin, go to Plugins > Installed Plugins > Beaver Builder. The version number is displayed beneath the plugin name. Alternatively, check the main plugin file (usually /wp-content/plugins/beaver-builder-lite-version/ or /wp-content/plugins/beaver-builder/) for the Version header in the file comments, or check the version in the Beaver Builder > Settings page.
    Affected if The displayed version is below 2.8.3.4 (including all versions through 2.8.3.2)
  2. Confirm plugin is active and accessible
    Verify the Beaver Builder plugin is activated in WordPress admin under Plugins > Installed Plugins. Also confirm the Beaver Builder builder interface is accessible by navigating to a page editor where Beaver Builder is enabled.
    Affected if The plugin is active and users can access the Beaver Builder editor interface, making the reflected XSS reachable
  3. Check plugin file version constant
    Inspect the main Beaver Builder plugin PHP file (such as class-fl-builder.php or the primary plugin file) for the version definition. Look for lines containing 'version' or 'FL_BUILDER_VERSION' constant to confirm the exact version number.
    Affected if The version constant in the code resolves to a version less than 2.8.3.4
  4. Review for unsanitized query parameters in Beaver Builder URLs
    Monitor HTTP request logs or use browser developer tools to inspect URLs containing ' Beaver Builder' paths (such as /?fl_builder, /?fl_builder_upload, or admin-ajax.php calls related to Beaver Builder). Check if any query parameters reflect user input back into the page without encoding.
    Affected if User-supplied input in Beaver Builder-related URLs is reflected in responses without HTML entity encoding

You are affected if the Beaver Builder plugin version is below 2.8.3.4 and the plugin is active, allowing reflected XSS via unsanitized user input in Beaver Builder pages.

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 2.8.3.4 or later
Fixed in 2.8.3.4
Interim mitigation

Update to patched Beaver Builder version when available; implement WAF rules and output encoding as interim measure; audit code for other XSS vectors.

Recommended fix High confidence

Beaver Builder 2.8.3.4

  1. Backup your WordPress site before making any changes
  2. Navigate to WordPress admin dashboard > Plugins
  3. Find Beaver Builder plugin and check for update available to version 2.8.3.4
  4. Update Beaver Builder to version 2.8.3.4 or later
  5. Verify the plugin shows version 2.8.3.4 or higher as installed
  6. Clear any caching layers if used (site cache, CDN cache)
  7. Test the Beaver Builder functionality to ensure the editor works correctly

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

Fix this in Beaver Builder Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.

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-2024-43926 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