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Avada <= 7.16 and Fusion Builder <= 3.16 — Unauthenticated Remote Code Execution via Arbitrary File Write

CVE-2026-18431Published · Updated

Action summary

Avada (Fusion) Builder: Affected: ≤3.16Update to 3.16.1 or newer

Avada | Website Builder For WordPress & WooCommerce: Affected: ≤7.16Update to 7.16.1 or newer

All remediation steps
Watch plugin
Severity
Critical9.8
CVSS
9.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-862 Missing Authorization
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

Avada (Fusion) Builder fusion-builder

  1. Affected≤ 3.16
  2. Patched in3.16.1

Update to 3.16.1 or newer.

You are affected if you run ≤ 3.16. Version 3.16.1 and later are not affected by this issue.

Avada | Website Builder For WordPress & WooCommerce Avada

  1. Affected≤ 7.16
  2. Patched in7.16.1

Update to 7.16.1 or newer.

You are affected if you run ≤ 7.16. Version 7.16.1 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Avada (Fusion) Builder.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 3.16.1, or a newer patched version
  2. Update to version 7.16.1, or a newer patched version
  3. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  4. Watch Avada (Fusion) Builder to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Alex Thomas, Wordfence Argus.

The Avada theme for WordPress is vulnerable to Arbitrary File Write in all versions up to, and including, 7.16 when the Fusion Builder plugin is installed and active in versions up to, and including, 3.16. This is due to a chain of authorization and input validation weaknesses across the two components that makes it possible for unauthenticated attackers to write attacker-controlled files to the server. This can be used to create and execute arbitrary PHP files, resulting in remote code execution and complete site compromise. Successful exploitation requires both Avada and Fusion Builder to be installed and active, as well as certain administrator-authored content to be present.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Avada (Fusion) Builder

All 33
More vulnerabilities in Avada (Fusion) Builder
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Form Notification Dynamic-Data action_hook
≤3.16.1Update to 3.16.2
CVE-2026-84938
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via 'tab_index' and 'empty_notice' Shortcode Attributes
≤3.16.2Update to 3.16.3
CVE-2026-104729
Medium5.3Unauthenticated Sensitive Information Exposure in 'args[link_target]' Parameter via {user_meta} Dynamic Data Token
≤3.16.1Update to 3.16.2
CVE-2026-97471
Critical9.1 Unauthenticated Arbitrary WordPress Action Invocation via '{action_hook}' Dynamic-Data Token in Form Field
≤3.16.1Update to 3.16.2
CVE-2026-97670
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via 'size' Shortcode Attribute
≤3.15.6Update to 3.16
CVE-2026-16654

Same weakness (Missing Authorization)

All Missing Authorization
Other Missing Authorization vulnerabilities
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup≤5.25.25Update to 5.26.45
CVE-2026-120688
Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder≤1.0.2Update to 1.1
CVE-2026-125055
Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System≤3.3.9Update to 3.4.0
CVE-2026-119077
Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce≤5.127.0Update to 5.128.0
CVE-2026-121518

Timeline

  1. CVE published

    Severity critical, CVSS 9.8

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers
[object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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