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CVE-2026-16654— Avada (Fusion) Builder <= 3.15.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'size' Shortcode Attribute

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.

themefusion Avada (Fusion) Builder是themefusion公司的一款页面构建器。 themefusion Avada (Fusion) Builder 3.15.6及之前版本存在跨站脚本漏洞，该漏洞源于对'size'短代码属性的输入清理和输出转义不足，导致存储型跨站脚本漏洞，经过身份验证且具有贡献者级别及以上权限的攻击者可注入任意Web脚本，当用户访问被注入的页面时执行。

CVSS 6.4 · Medium EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1189.001

Affected Version Matrix 1

VendorProduct Version RangeStatus
themefusion Avada (Fusion) Builder ≤ 3.15.6 affected
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I. Basic Information for CVE-2026-16654

Vulnerability Information
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Vulnerability Title
Avada (Fusion) Builder <= 3.15.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'size' Shortcode Attribute
Source: CVE Program / CVE List V5
Vulnerability Description
The Avada (Fusion) Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'size' Shortcode Attribute in all versions up to, and including, 3.15.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. WordPress's wp_kses_post filter does not neutralize the payload because the injected content resides entirely within a shortcode attribute string containing no HTML angle brackets, causing kses to pass it through unchanged at save time.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
themefusion Avada (Fusion) Builder 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
themefusion Avada (Fusion) Builder是themefusion公司的一款页面构建器。 themefusion Avada (Fusion) Builder 3.15.6及之前版本存在跨站脚本漏洞，该漏洞源于对'size'短代码属性的输入清理和输出转义不足，导致存储型跨站脚本漏洞，经过身份验证且具有贡献者级别及以上权限的攻击者可注入任意Web脚本，当用户访问被注入的页面时执行。
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 ~ 3.15.6 -

II. Public POCs for CVE-2026-16654

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III. Intelligence Information for CVE-2026-16654

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Security Blog Posts for CVE-2026-16654 (1)

IV. Related Vulnerabilities

Same product: Avada (Fusion) Builder
Same vendor: themefusion
Same weakness: CWE-79

V. Comments for CVE-2026-16654

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