CVE-2026-84938

Avada (Fusion) Builder <= 3.16.1 - Unauthenticated Stored Cross-Site Scripting via Form Notification Dynamic-Data action_hook

2026-11-09 18:41
daroo

Strategic Overview

Status
Patched in 3.16.2
Affected Plugin
Avada (Fusion) Builder
Affected Version
<= 3.16.1
CVSS
7.2High
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation
CVE
CVE-2026-84938
View all Avada (Fusion) Builder vulnerabilities

At a glance

CVE-2026-84938 is a high-severity Improper Neutralization of Input During Web Page Generation vulnerability in the Avada (Fusion) Builder WordPress plugin, affecting versions <= 3.16.1. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.16.2; sites on affected versions should update now. Disclosed November 2026, reported by daroo.

Vulnerability Overview

The Avada (Fusion) Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Form Notification Dynamic-Data action_hook → Media Upload Chain (ID3 Metadata / html_attributes) in all versions up to, and including, 3.16.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires that a Fusion Form is embedded on an admin-authored page (granting manage_options context to the Dynamic Data action hook callback), and that a Post Cards element configured to display attachment post types is present on a publicly accessible page so the planted shortcode payload is rendered.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation

Reaching this weakness in Avada (Fusion) Builder <= 3.16.1 takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Avada (Fusion) Builder the fix is 3.16.2: builds <= 3.16.1 are affected, anything from 3.16.2 onward is not.

Remediation

Update to version 3.16.2, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Avada (Fusion) Builder 3.16.2 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-84938https://www.wordfence.com/threat-intel/vulnerabilities/id/ec9636d5-80bc-418e-9348-a1d2777bf1fchttps://nvd.nist.gov/vuln/detail/CVE-2026-84938

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C