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CVE-2026-101921— WPForms <= 2.0.2.1 - Reflected Cross-Site Scripting via 'query_var' Smart Tag in iframe srcdoc Attribute

Quick assessment

Affected
smub WPForms – AI Form Builder for WordPress – Contact Forms, Payment Forms, Survey Form, Quiz & More
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 WPForms – AI Form Builder for WordPress（包含联系表单、支付表单、调查表单、测验等功能）的所有版本（包括 2.0.2.1 及更早版本）中存在反射型跨站脚本（Reflected Cross-Site Scripting, XSS）漏洞。该漏洞源于插件在 “attacker-chosen key referenced by the smart tag (e.g. 'x')” 参数中缺乏充分的输入过滤和输出转义处理。 攻击者无需身份认证即可将恶意脚本注入到网

CVSS 4.7 · Medium EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
smub WPForms – AI Form Builder for WordPress – Contact Forms, Payment Forms, Survey Form, Quiz & More ≤ 2.0.2.1 affected
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I. Basic Information for CVE-2026-101921

Vulnerability Information
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Vulnerability Title
WPForms <= 2.0.2.1 - Reflected Cross-Site Scripting via 'query_var' Smart Tag in iframe srcdoc Attribute
Source: CVE Program / CVE List V5
Vulnerability Description
The WPForms – AI Form Builder for WordPress – Contact Forms, Payment Forms, Survey Form, Quiz & More plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'attacker-chosen key referenced by the smart tag (e.g. "x")' parameter in all versions up to, and including, 2.0.2.1 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. Exploitation requires that a site administrator has previously saved a form whose description embeds a {query_var} Smart Tag inside an iframe srcdoc attribute and has enabled Show Description on a public-facing page.
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
smub WPForms – AI Form Builder for WordPress – Contact Forms, Payment Forms, Survey Form, Quiz & More 0 ~ 2.0.2.1 -

II. Public POCs for CVE-2026-101921

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III. Intelligence Information for CVE-2026-101921

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Patches & Fixes for CVE-2026-101921 (3)

Vendor Advisories for CVE-2026-101921 (1)

IV. Related Vulnerabilities

Same product: WPForms – AI Form Builder for WordPress – Contact Forms, Payment Forms, Survey Form, Quiz & More
Same vendor: smub
Same weakness: CWE-79

V. Comments for CVE-2026-101921

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