Vulnerability · Published Aug 26, 2026 · Assigned by Wordfence
CVE-2026-18431Avada <= 7.16 and Fusion Builder <= 3.16 - Unauthenticated Remote Code Execution via Arbitrary File Write
Critical 9.8
In plain English
A critical-severity missing authorization in Avada | Website Builder For WordPress & WooCommerce from ThemeFusion. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| themefusion | Avada (Fusion) Builder | 0 – through 3.16 |
| ThemeFusion | Avada | Website Builder For WordPress & WooCommerce | 0 – through 7.16 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H