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CVE-2026-3851— Divi <= 4.27.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via Dynamic Content (Legacy JSON Format) Shortcode

Quick assessment

Affected
Elegant Themes Divi
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 Divi 主题在所有版本（包括 4.27.6 及更早版本）中，因其“动态内容”功能的旧版 JSON 格式存在存储型跨站脚本（Stored XSS）漏洞。该漏洞由两个相互叠加的缺陷共同导致： 1. 保存时过滤器的覆盖范围不足：保存时的净化过滤器 仅能识别 格式的标记，但渲染引擎还支持一种旧版 JSON 格式。该格式在渲染时会被静默转换，从而完全绕过了保存时的过滤逻辑。 2. 解析器未对启用 HTML 时的元数据值进行净化：在 函数中，当 设置为 时， 解析器未对解析出的元数据值应用 净化函数，

CVSS 6.4 · Medium
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I. Basic Information for CVE-2026-3851

Vulnerability Information
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Vulnerability Title
Divi <= 4.27.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via Dynamic Content (Legacy JSON Format) Shortcode
Source: CVE Program / CVE List V5
Vulnerability Description
The Divi theme for WordPress is vulnerable to Stored Cross-Site Scripting via the Dynamic Content feature's legacy JSON format in all versions up to, and including, 4.27.6. This is due to two compounding flaws: (1) the save-time sanitization filter `et_builder_sanitize_dynamic_content_fields()` only searches for dynamic content markers in the `@ET-DC@...@` format, but the rendering engine also supports a legacy JSON format that is silently converted at render time, completely bypassing the save-time filter, and (2) the `post_meta_key` resolver in `et_builder_filter_resolve_default_dynamic_content()` does not apply `wp_kses_post()` to the resolved meta value when `enable_html` is set to `on`, passing raw `get_post_meta()` output directly to the page. 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.
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
Elegant Themes Divi 0 ~ 4.27.6 -

II. Public POCs for CVE-2026-3851

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III. Intelligence Information for CVE-2026-3851

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Security Blog Posts for CVE-2026-3851 (1)

Vendor Pages for CVE-2026-3851 (1)

IV. Related Vulnerabilities

Same product: Divi
Same vendor: Elegant Themes
Same weakness: CWE-79

V. Comments for CVE-2026-3851

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