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CVE-2026-18431— Avada <= 7.16 and Fusion Builder <= 3.16 - Unauthenticated Remote Code Execution via Arbitrary File Write

Quick assessment

Affected
themefusion Avada (Fusion) Builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Avada theme是Avada公司的一款网站主题构建工具。 Avada theme 7.16及之前版本和Fusion Builder 3.16及之前版本存在授权问题漏洞，该漏洞源于授权和输入验证缺陷链，可能导致未经身份验证的攻击者向服务器写入攻击者控制的文件，进而创建并执行任意PHP文件，导致远程代码执行和完全站点接管。

CVSS 9.8 · Critical EPSS 0.92% · P59

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
themefusion Avada (Fusion) Builder ≤ 3.16 affected
ThemeFusion Avada | Website Builder For WordPress & WooCommerce ≤ 7.16 affected
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I. Basic Information for CVE-2026-18431

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Avada <= 7.16 and Fusion Builder <= 3.16 - Unauthenticated Remote Code Execution via Arbitrary File Write
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Avada theme 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avada theme是Avada公司的一款网站主题构建工具。 Avada theme 7.16及之前版本和Fusion Builder 3.16及之前版本存在授权问题漏洞，该漏洞源于授权和输入验证缺陷链，可能导致未经身份验证的攻击者向服务器写入攻击者控制的文件，进而创建并执行任意PHP文件，导致远程代码执行和完全站点接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
themefusion Avada (Fusion) Builder 0 ~ 3.16 -
ThemeFusion Avada | Website Builder For WordPress & WooCommerce 0 ~ 7.16 -

II. Public POCs for CVE-2026-18431

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III. Intelligence Information for CVE-2026-18431

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Vendor Advisories for CVE-2026-18431 (1)

IV. Related Vulnerabilities

Same product: Avada (Fusion) Builder
Same vendor: themefusion
Same weakness: CWE-862

V. Comments for CVE-2026-18431

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