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CVE-2026-103912— JetFormBuilder <= 3.6.6 - Reflected DOM-Based Cross-Site Scripting via 'query_var' Dynamic Preset via data-jfb-macro / JFB_FIELD:: Macro Renderer

Quick assessment

Affected
jetmonsters JetFormBuilder — Dynamic Blocks Form 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 插件 JetFormBuilder — Dynamic Blocks Form Builder 存在反射型基于 DOM 的跨站脚本（DOM-Based XSS）漏洞。该漏洞存在于 3.6.6 及之前所有版本中，原因是插件对输入数据缺乏充分的清理和输出转义。攻击者可以利用名为 的参数，在未认证的情况下，将任意恶意 Web 脚本注入到页面中。当用户被诱骗执行某些操作（例如点击恶意链接）时，这些脚本便会在页面中执行。 该漏洞仅在包含嵌入表单的页面上可被利用，且该表单中必须配置了一个文本字段，其使用了带

CVSS 4.7 · Medium EPSS 0.19% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
jetmonsters JetFormBuilder — Dynamic Blocks Form Builder ≤ 3.6.6 affected
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I. Basic Information for CVE-2026-103912

Vulnerability Information
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Vulnerability Title
JetFormBuilder <= 3.6.6 - Reflected DOM-Based Cross-Site Scripting via 'query_var' Dynamic Preset via data-jfb-macro / JFB_FIELD:: Macro Renderer
Source: CVE Program / CVE List V5
Vulnerability Description
The JetFormBuilder — Dynamic Blocks Form Builder plugin for WordPress is vulnerable to Reflected DOM-Based Cross-Site Scripting via the '<attacker-chosen query var name matching the preset's query_var setting>' parameter in all versions up to, and including, 3.6.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. This is only exploitable on pages embedding a form that has a text field configured with a query_var Dynamic Preset and a data-jfb-macro or JFB_FIELD:: macro reference targeting that field, both of which are standard, documented plugin features.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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
jetmonsters JetFormBuilder — Dynamic Blocks Form Builder 0 ~ 3.6.6 -

II. Public POCs for CVE-2026-103912

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III. Intelligence Information for CVE-2026-103912

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Patches & Fixes for CVE-2026-103912 (1)

Vendor Advisories for CVE-2026-103912 (1)

Other References for CVE-2026-103912 (2)

IV. Related Vulnerabilities

Same product: JetFormBuilder — Dynamic Blocks Form Builder
Same vendor: jetmonsters
Same weakness: CWE-79

V. Comments for CVE-2026-103912

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