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.
WordPress 的 Avada (Fusion) Builder 插件在 3.15.6 及之前的所有版本中，由于输入净化不足和输出转义缺失，存在通过短代码 'size' 属性导致的存储型跨站脚本（Stored XSS）漏洞。这使得拥有贡献者级别及以上权限的已认证攻击者能够向页面中注入任意 Web 脚本，这些脚本将在用户访问被注入的页面时执行。由于注入的内容完全包含在短代码属性字符串中，且该字符串内不含 HTML 尖括号，因此 WordPress 的 过滤器未能中和该载荷，导致其在保存时原样通过。
Possible ATT&CK Techniques 1 AI
T1189.001Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| themefusion | Avada (Fusion) Builder | 0 ~ 3.15.6 | - |
|
II. Public POCs for CVE-2026-16654
| # | POC Description | Source Link | Shenlong Link |
|---|
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Security Blog Posts for CVE-2026-16654 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-16654
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